generated from jric11/baseProject
289 lines
10 KiB
PHP
289 lines
10 KiB
PHP
<?php
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/**
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* E053_spot_overprint_proof.php
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*
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* Demonstrates spot color registration, tint ramp generation, and
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* overprint simulation using tc-lib-color and tc-lib-pdf-graph.
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*
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* What this demonstrates:
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* - color->addSpotColor(): register named spot colors with CMYK equivalents.
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* - color->getPdfColor($name, $stroke, $tint): apply spot ink at any tint level.
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* - Tint ramps: a sequence of filled rectangles stepping from 0% to 100% tint.
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* - Layered spot rectangles: simulate overprint by stacking semi-transparent shapes.
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* - Companion lib: tc-lib-color (spot/Lab color model), tc-lib-pdf-graph (rects).
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*
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* Note: tc-lib-pdf does not expose a native /OP (overprint) ExtGState toggle.
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* Overprint simulation here uses stacked shapes with varying tints to give a
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* visual impression of ink mixing, which is representative for screen proofing.
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*
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* @since 2026-05-01
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* @category Library
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* @package Pdf
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 2002-2026 Nicola Asuni - Tecnick.com LTD
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* @license https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
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* @link https://github.com/tecnickcom/tc-lib-pdf
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*
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* This file is part of tc-lib-pdf software library.
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*/
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// NOTE: local file reads (images, fonts, attachments) are restricted to an allowlist of
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// trusted paths that covers this package tree, so run the examples in place. To read assets
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// from other locations, list them in the 'allowedPaths' entry of the fileOptions constructor
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// parameter (see E047_remote_resources_security.php).
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// NOTE: run make fonts in the project root to generate the dependencies and example fonts.
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require __DIR__ . '/../vendor/autoload.php';
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define('K_PATH_FONTS', (string) realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));
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$pdf = new \Com\Tecnick\Pdf\Tcpdf(
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unit: \Com\Tecnick\Pdf\Page\Unit::Millimeter,
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isunicode: true,
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subsetfont: false,
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compress: true,
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mode: \Com\Tecnick\Pdf\PdfConformance::None,
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objEncrypt: null,
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);
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$pdf->setCreator('tc-lib-pdf');
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$pdf->setAuthor('Nicola Asuni');
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$pdf->setSubject('tc-lib-pdf example: 053');
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$pdf->setTitle('Spot Color & Overprint Proof');
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$pdf->setKeywords('TCPDF tc-lib-pdf spot color CMYK tint ramp overprint proof');
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$pdf->setPDFFilename('053_spot_overprint_proof.pdf');
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$pdf->setViewerPreferences(['DisplayDocTitle' => true]);
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$pdf->enableDefaultPageContent();
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// ----------
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// Register spot colors with CMYK fallback values.
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// These simulate industry-standard spot-like named inks. In a real press
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// workflow the names would match the RIP spot-color library exactly.
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$pdf->color->addSpotColor('PROOF Cyan', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 1.0,
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'magenta' => 0.0,
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'yellow' => 0.0,
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'key' => 0.0,
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'alpha' => 0.0,
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]));
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$pdf->color->addSpotColor('PROOF Magenta', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 0.0,
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'magenta' => 1.0,
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'yellow' => 0.0,
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'key' => 0.0,
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'alpha' => 0.0,
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]));
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$pdf->color->addSpotColor('PROOF Yellow', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 0.0,
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'magenta' => 0.0,
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'yellow' => 1.0,
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'key' => 0.0,
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'alpha' => 0.0,
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]));
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$pdf->color->addSpotColor('PROOF Black', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 0.0,
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'magenta' => 0.0,
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'yellow' => 0.0,
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'key' => 1.0,
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'alpha' => 0.0,
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]));
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$pdf->color->addSpotColor('PROOF Warm Red', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 0.0,
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'magenta' => 0.85,
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'yellow' => 0.9,
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'key' => 0.02,
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'alpha' => 0.0,
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]));
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$pdf->color->addSpotColor('PROOF Reflex Blue', new \Com\Tecnick\Color\Model\Cmyk([
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'cyan' => 0.93,
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'magenta' => 0.75,
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'yellow' => 0.0,
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'key' => 0.02,
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'alpha' => 0.0,
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]));
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// ----------
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$labelFont = $pdf->font->insert($pdf->pon, 'helvetica', 'B', 8);
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$noteFont = $pdf->font->insert($pdf->pon, 'helvetica', '', 8);
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// ===| Page 1 – Tint Ramps |=================================================
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$pdf->addPage(['format' => 'A4']);
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$pdf->page->addContent($labelFont['out']);
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$introHtml = '<h1 style="font-family: helvetica;">Spot Color Proof — Tint Ramps</h1>
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<p style="font-family: helvetica; font-size: 9pt;">
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Each row shows a named spot color at tints from 10% to 100%.
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Spot colors are registered via <code>color->addSpotColor()</code> with a CMYK equivalent
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and applied using <code>color->getPdfColor($name, $stroke, $tint)</code>.
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The label column shows the spot name as it would appear in a PDF color dictionary.
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</p>';
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$pdf->addHTMLCell(html: $introHtml, posx: 15, posy: 20, width: 175);
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// List of spots to render and their display label color
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/** @var array<int, array{name: string, label: string}> $spotRows */
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$spotRows = [
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['name' => 'PROOF Cyan', 'label' => '#007799'],
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['name' => 'PROOF Magenta', 'label' => '#990077'],
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['name' => 'PROOF Yellow', 'label' => '#887700'],
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['name' => 'PROOF Black', 'label' => '#222222'],
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['name' => 'PROOF Warm Red', 'label' => '#993300'],
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['name' => 'PROOF Reflex Blue', 'label' => '#001177'],
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];
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$tintSteps = 10;
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$swatchW = 14.0;
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$swatchH = 10.0;
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$labelW = 42.0;
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$rowGap = 2.0;
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$startX = 15.0;
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$startY = 55.0;
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// Draw tint scale header
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$pdf->page->addContent($noteFont['out']);
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for ($t = 1; $t <= $tintSteps; $t++) {
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$tx = $startX + $labelW + (($t - 1) * $swatchW);
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$pdf->page->addContent($pdf->getTextCell(
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txt: (string) ($t * 10) . '%',
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posx: $tx,
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posy: $startY - 5,
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width: $swatchW,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Center,
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));
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}
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$rowY = $startY;
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foreach ($spotRows as $row) {
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$spotName = $row['name'];
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$labelColor = $row['label'];
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// Spot name label
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$pdf->page->addContent($labelFont['out']);
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$pdf->page->addContent($pdf->color->getPdfColor($labelColor, true, 1.0));
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$pdf->page->addContent($pdf->color->getPdfColor($labelColor, false, 1.0));
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$pdf->page->addContent($pdf->getTextCell(
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txt: $spotName,
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posx: $startX,
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posy: $rowY + 2,
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width: $labelW,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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));
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// Draw tint swatches 10%–100%
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for ($t = 1; $t <= $tintSteps; $t++) {
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$tint = $t / $tintSteps;
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$sx = $startX + $labelW + (($t - 1) * $swatchW);
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// Set fill and stroke to spot color at this tint level
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$pdf->page->addContent($pdf->color->getPdfColor($spotName, true, $tint));
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$pdf->page->addContent($pdf->color->getPdfColor($spotName, false, $tint));
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$pdf->page->addContent($pdf->graph->getRect($sx, $rowY, $swatchW, $swatchH, 'DF'));
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}
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$rowY += $swatchH + $rowGap;
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}
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// Reset to black for subsequent text
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$pdf->page->addContent($pdf->color->getPdfColor('black', true, 1.0));
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$pdf->page->addContent($pdf->color->getPdfColor('black', false, 1.0));
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$pdf->page->addContent($noteFont['out']);
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$footNote = '<p style="font-family: helvetica; font-size: 8pt; color: #555555; margin-top: 4mm;">
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Spot colors use the PDF <em>Separation</em> color space with a CMYK alternate.
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Screen rendering uses the CMYK alternate; print output uses the named ink.
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</p>';
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$pdf->addHTMLCell(html: $footNote, posx: 15, posy: 170, width: 175);
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// ===| Page 2 – Stacked Spot Layers (Overprint Simulation) |=================
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$pdf->addPage(['format' => 'A4']);
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$pdf->page->addContent($labelFont['out']);
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$overHtml = '<h1 style="font-family: helvetica;">Overprint Simulation — Stacked Spot Layers</h1>
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<p style="font-family: helvetica; font-size: 9pt;">
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Two spot inks are drawn in overlapping rectangles at varying tints to simulate
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the visual effect of overprinting. In a real press workflow the RIP controls overprint
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behaviour via the <em>/OP</em> and <em>/op</em> ExtGState flags.
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This page shows the CMYK-alternate screen rendering of the overlap.
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</p>';
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$pdf->addHTMLCell(html: $overHtml, posx: 15, posy: 20, width: 175);
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// Overprint grid: every combination of Cyan × Magenta at 25/50/75/100% tints
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$ox = 25.0;
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$oy = 55.0;
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$cellSize = 22.0;
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$tints = [0.25, 0.5, 0.75, 1.0];
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$labelNames = ['25%', '50%', '75%', '100%'];
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// Column headers (Cyan tint)
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$pdf->page->addContent($labelFont['out']);
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foreach ($labelNames as $ci => $clab) {
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$pdf->page->addContent($pdf->getTextCell(
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txt: 'C ' . $clab,
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posx: $ox + 12 + ($ci * $cellSize),
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posy: $oy - 7,
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width: $cellSize,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Center,
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));
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}
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foreach ($tints as $mi => $mTint) {
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// Row header (Magenta tint)
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$pdf->page->addContent($pdf->getTextCell(
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txt: 'M ' . $labelNames[$mi],
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posx: $ox,
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posy: $oy + ($mi * $cellSize) + 5,
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width: 12,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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));
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foreach ($tints as $ci => $cTint) {
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$cx = $ox + 12 + ($ci * $cellSize);
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$cy = $oy + ($mi * $cellSize);
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// Draw Cyan layer first, then Magenta layer on top
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$pdf->page->addContent($pdf->color->getPdfColor('PROOF Cyan', false, $cTint));
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$pdf->page->addContent($pdf->graph->getRect($cx, $cy, $cellSize, $cellSize, 'F'));
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$pdf->page->addContent($pdf->color->getPdfColor('PROOF Magenta', false, $mTint));
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$pdf->page->addContent($pdf->graph->getAlpha(0.6)); // partial alpha to show both layers
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$pdf->page->addContent($pdf->graph->getRect($cx, $cy, $cellSize, $cellSize, 'F'));
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$pdf->page->addContent($pdf->graph->getAlpha(1.0)); // restore
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}
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}
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// Reset colors
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$pdf->page->addContent($pdf->color->getPdfColor('black', true, 1.0));
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$pdf->page->addContent($pdf->color->getPdfColor('black', false, 1.0));
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$overNote = '<p style="font-family: helvetica; font-size: 8pt; color: #555555; margin-top: 4mm;">
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Each cell renders Cyan at the column tint, then Magenta at the row tint with 60% opacity —
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approximating a soft-proof of two overprinted inks on a white substrate.
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</p>';
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$pdf->addHTMLCell(html: $overNote, posx: 15, posy: 165, width: 175);
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// ----------
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$rawpdf = $pdf->getOutPDFString();
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$pdf->renderPDF(rawpdf: $rawpdf);
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