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PDF: PDF/X-1a test covers a tagged 16-bit gray TIFF

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The PDF/X-1a case of tagged_tiffs_keep_their_icc_profile also exports a
16-bit gray TIFF with a gray profile, kept as it is, resampled and
compressed with JPEG, and checks each written file with the PDF/X-1a
check as well as its image color space.
This commit is contained in:
dotCooCoo
2026-11-14 12:11:04 -08:00
parent 9317ee0653
commit aa3e74384b
1 changed files with 8 additions and 4 deletions
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crates/pdf/src/tests/compression.rs
+8 -4
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@@ -455,18 +455,22 @@ fn tagged_tiffs_keep_their_icc_profile() {
let spaces = export(&tiff(&colour(), &rgb), json!({"output": {"conversion": "destination", "destination": destination}}));
assert!(spaces.len() == 1 && spaces[0].icc.as_deref() != Some(rgb.as_slice()), "converted to {destination}: {spaces:?}");
}
// PDF/X-1a allows no ICC-based color spaces: a tagged gray TIFF, PNG or JPEG is written in
// DeviceGray, kept as it is, resampled or compressed with JPEG.
// PDF/X-1a allows no ICC-based color spaces: a tagged gray TIFF (8 or 16 bits), PNG or JPEG is
// written in DeviceGray, kept as it is, resampled or compressed with JPEG, and the file passes
// the PDF/X-1a check.
let compressions = [json!({}), json!({"gray": {"downsample": "bicubic", "ppi": 150, "abovePpi": 225}}), json!({"gray": {"compression": "jpeg"}})];
let tiff16 = tiff(&DynamicImage::ImageLuma16(colour().to_luma16()), &gray);
let png = doc(tagged(&colour().grayscale(), &gray, ImageFormat::Png), "image/png");
let jpeg = doc(tagged(&colour().grayscale(), &gray, ImageFormat::Jpeg), "image/jpeg");
for (format, d) in [("TIFF", tiff(&colour().grayscale(), &gray)), ("PNG", png), ("JPEG", jpeg)] {
for (format, d) in [("TIFF", tiff(&colour().grayscale(), &gray)), ("TIFF, 16 bits", tiff16), ("PNG", png), ("JPEG", jpeg)] {
for compression in &compressions {
let mut settings: PdfSettings =
serde_json::from_value(json!({"standard": "pdfX1a", "compatibility": "1.3", "compression": compression.clone()})).unwrap();
settings.compression.compress_text = false;
let r = export_with_report(&d, &PdfOptions { settings, ..Default::default() });
let spaces = image_spaces(&r.unwrap_or_else(|e| panic!("PDF/X-1a, {format}, {compression}: {e}")).bytes);
let bytes = r.unwrap_or_else(|e| panic!("PDF/X-1a, {format}, {compression}: {e}")).bytes;
crate::pdfx::verify(&bytes, Standard::PdfX1a).unwrap_or_else(|e| panic!("PDF/X-1a, {format}, {compression}: {e}"));
let spaces = image_spaces(&bytes);
let gray = spaces.len() == 1 && spaces[0].space == "DeviceGray" && spaces[0].icc.is_none();
assert!(gray, "PDF/X-1a, {format}, {compression}: {spaces:?}");
}