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Fix Separation color space and add tests

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This commit is contained in:
BobLd 2024-08-26 17:13:48 +01:00
parent b4649758c6
commit 3191cdc446
2 changed files with 43 additions and 9 deletions
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37
src/UglyToad.PdfPig.Tests/Integration/ColorSpaceTests.cs
View File

@ -101,7 +101,7 @@
{
var page1 = document.GetPage(1);
var images = page1.GetImages().ToArray();
var image1page1 = images.ElementAt(0);
var image1page1 = images[0];
var separationCs = image1page1.ColorSpaceDetails as SeparationColorSpaceDetails;
Assert.NotNull(separationCs);
Assert.True(separationCs.AlternateColorSpace is DeviceCmykColorSpaceDetails);
@ -116,6 +116,39 @@
}
}
[Fact]
public void SeparationColorSpace()
{
var path = IntegrationHelpers.GetDocumentPath("MOZILLA-3136-0.pdf");
using (var document = PdfDocument.Open(path))
{
var page = document.GetPage(4);
var images = page.GetImages().ToArray();
var image4 = images[4];
var separation = image4.ColorSpaceDetails as SeparationColorSpaceDetails;
Assert.NotNull(separation);
Assert.True(image4.TryGetPng(out var png4));
File.WriteAllBytes(Path.Combine(OutputFolder, "MOZILLA-3136-0_4_separation.png"), png4);
// Green dolphin image
// "Colorized TIFF (should appear only in GWG Green separation)"
var image9 = images[9];
var indexedCs = image9.ColorSpaceDetails as IndexedColorSpaceDetails;
Assert.NotNull(indexedCs);
Assert.Equal(ColorSpace.Separation, indexedCs.BaseColorSpace.Type);
Assert.True(image9.TryGetPng(out var png9));
File.WriteAllBytes(Path.Combine(OutputFolder, "MOZILLA-3136-0_9_separation.png"), png9);
}
}
[Fact]
public void IndexedCalRgbColorSpaceImages()
{
@ -217,7 +250,7 @@
File.WriteAllBytes(Path.Combine(OutputFolder, "MOZILLA-10225-0_341_0.png"), bytes341_0);
}
}
[Fact]
public void SeparationLabColorSpace()
{

15
src/UglyToad.PdfPig/Graphics/Colors/ColorSpaceDetails.cs
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@ -728,18 +728,19 @@
/// <inheritdoc/>
internal override ReadOnlySpan<byte> Transform(ReadOnlySpan<byte> values)
{
var cache = new Dictionary<int, double[]>(values.Length * 3);
var transformed = new List<byte>(values.Length * 3);
for (var i = 0; i < values.Length; i += 3)
var colorCache = new Dictionary<int, double[]>(values.Length);
var transformed = new List<byte>(values.Length);
for (var i = 0; i < values.Length; ++i)
{
byte b = values[i++];
if (!cache.TryGetValue(b, out double[]? colors))
byte b = values[i];
if (!colorCache.TryGetValue(b, out double[]? colors))
{
colors = Process(b / 255.0);
cache[b] = colors;
colorCache[b] = colors;
}
for (int c = 0; c < colors.Length; c++)
for (int c = 0; c < colors.Length; ++c)
{
transformed.Add(ConvertToByte(colors[c]));
}