[Feature]: Aggressive image optimization without color quantization

[user1823]

Describe the proposed feature

Sometimes, I want to reduce the file size of the output PDF, especially when force-ocr produces a file much larger than the input PDF. For this, the currently recommended option is to use --optimize 2 or --optimize 3. These options indeed produce a smaller file size. However, they also use pngquant to quantize the colors. But, sometimes, accurate color reproduction is important to me and quantization causes the colors in the output to differ from the input.

So, I would request you to add a switch to disable color quantization even when --optimize 2 or --optimize 3 are used.

[jbarlow83]

Does --png-quality 100 help? That parameter is used to control pngquant. Maybe that is a quicker solution.

You can also remove pngquant from the environment by uninstalling or manipulating PATH. It only be used if ocrmypdf finds it.