Images are converted once, when decoded, from their own colour space
into the file's (sRGB or Display P3): ICC profiles in PNG, JPG, WebP and
TIFF (matrix/curve and table profiles, RGB or grey, run by moxcms, which
the image crate already builds) and a PNG's sRGB, gAMA and cHRM chunks.
Images without a usable profile (none, CMYK, damaged, over 4 MB) are
taken as sRGB as before. The image fill's details show the source
profile and image.place reports it as imageProfile.
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