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Do not store obsolete tRNS chunk data following processing. #2975

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Merged
merged 3 commits into from
Aug 11, 2025
Merged

Do not store obsolete tRNS chunk data following processing. #2975

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dd06da4
Fix #2974
JimBobSquarePants Aug 5, 2025
20975bc
Update src/ImageSharp/Formats/Png/PngMetadata.cs
JimBobSquarePants Aug 5, 2025
ef46153
Merge branch 'main' into js/fix-2974
JimBobSquarePants Aug 11, 2025
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19 changes: 18 additions & 1 deletion src/ImageSharp/Formats/Png/PngMetadata.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,24 @@ public FormatConnectingMetadata ToFormatConnectingMetadata()
/// <inheritdoc/>
public void AfterImageApply<TPixel>(Image<TPixel> destination, Matrix4x4 matrix)
where TPixel : unmanaged, IPixel<TPixel>
=> this.ColorTable = null;
{
this.ColorTable = null;

// If the color type is RGB and we have a transparent color, we need to switch to RGBA
// so that we do not incorrectly preserve the obsolete tRNS chunk.
if (this.ColorType == PngColorType.Rgb && this.TransparentColor.HasValue)
{
this.ColorType = PngColorType.RgbWithAlpha;
this.TransparentColor = null;
}

// The same applies for Grayscale.
if (this.ColorType == PngColorType.Grayscale && this.TransparentColor.HasValue)
{
this.ColorType = PngColorType.GrayscaleWithAlpha;
this.TransparentColor = null;
}
}

/// <inheritdoc/>
IDeepCloneable IDeepCloneable.DeepClone() => this.DeepClone();
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