image optimizer for web

I have a problem with JPG files after optimizing with "-s9 -strip" parameters. I use pingo a67, I don't know if older versions did it too.

Images look ok, but when I open them in Adobe Photoshop 24 they are full of artifacts and color errors. They are ok in other image browsers.

I recognized the same problem with artefacts and wrong color information after compression jpeg files with pingo.

Pingo use a very high compression, which is not compatible with Adobe Photoshop, because they use an old jpeg import function.

All modern programs like IrfanView, XnViewMP, Gimp, etc. use the newer jpeg import libraries which could read the compressed jpeg files.

It is shame, that Adobe Photoshop could not read them correctly.
But Adobe does not support so many modern file formats (jpeg xl, avif, etc.).

I did some further tests with pingo Alpha 70 and the best settings for Adobe Photoshop compatibility are the following parameters. I think it is not possible to use them in pinga gui for pingo.


pingo.exe -jpgtype=1 -s0 *.jpg

It uses the progressive jpeg compression and it is a loseless jpeg file optimization!
These settings do not remove any metadata or exif informations!
It is possible to remove them, too.