Inverted image colors in svg starting from 1.26.6

[ASTimch]

Description of the bug

Starting from v 1.26.6 page.get_svg_image() generates svg with inverted colors in jpeg.

How to reproduce the bug

Here simple code

def pdf_to_svg(pdf_path, output_svg_path):

    with fitz.open(pdf_path) as doc:
        page = doc[0]
        svg_content = page.get_svg_image()
        with open(output_svg_path, "w", encoding="utf-8") as f:
            f.write(svg_content)


if __name__ == "__main__":
    pdf_to_svg("test1.pdf", "test1.svg")

Test pdf and results for different versions attached.

test1.pdf

svg from v1.25.5

svg from v1.25.6

svg from v1.25.7

PyMuPDF version

1.26.6

Operating system

Windows

Python version

3.11

[JorjMcKie]

The problem is caused by a missing step when outputting the embedded CMYK image at xref 46 to JPEG format in SVG.
A similar fix has been applied to PyMuPDF's own image extraction feature for this image type some time ago.
Creating SVG images of pages is however implemented as a direct call of MuPDF functions - so we need to determine how to trigger MuPDF doing this conversion for us ...

Just to be clear:
This happens for embedded CMYK images only.