A JPG exported in a profile other than the document's was converted while
still translucent and then composited over white, so translucent fills,
shadows and antialiased edges came out a few levels off what the document
shows. The render is now flattened over white in the document's profile
first. PNG and WebP keep their alpha and are unchanged.
Each export setting has a color profile: Same as file (the default, the
document's profile when it exports), sRGB or Display P3. PNG, JPG and
WebP settings list it in their advanced settings, and export.add,
export.update, file.export, file.exportLayers (for every setting) and
the MCP export tool take it as colorProfile. The rendered pixels are
converted to the chosen profile (out-of-gamut colors clip) and the file
is tagged as before: an sRGB chunk for sRGB PNG, the generated ICC
profile (and cICP in PNG) for Display P3; sRGB JPG and WebP stay
untagged. A setting keeps its choice when its format changes, and
settings saved without one read as Same as file.
SVG, PDF and Android XML show no choice and stay sRGB; PDF has no
output intent yet.
bflatastic