P: Export As image quality significantly lower than old Save for Web

Could you share the original file you're using to export from for the eng team to investigate?

Just to add to this (because I don't know if a shared library might be involved) but there is a bug in Bridge where Extendscript bitmapData.resize() sometimes rounds incorrectly. An exact 5:4 file sometimes resizes to 1000x799 pixels, for example. It was reported sometime back to the Bridge team. I ran into it during development of my JPEG MiniExport script for Bridge. I haven't seen it with the new Bridge Export feature.

I'm seeing something strange. When I use Export As with a 5616 x 3744 exact 3:2 aspect ratio the Image Size changes to 1502 x 1000 when entering either W or H value first. Also the Export As JPEG file appears slightly sharper than the Save for Web JPEG using the same settings except it is 1500 x 1000, which is opposite what the OP is seeing.

I've tried them all and none seem to do any  appreciable change to the image. Maybe the Preserve Details is a touch better, but we're talking about a little touch really, it doesn't solve the issue at all.

Hi Louis, in Export As, what setting do you have for "Resample" under Image Size?