noobie-iv
commented
9 months ago There is a more difficult question. For example, there is a page with text, a color graph and a photo. We need to:
- Increase the text resolution and save text to tiff with fax4 compression
- Maybe increase the graph resolution and save graph to tiff with LZW/Deflate/... compression, or to png
- Leave image resolution unchanged and save image to jpeg.
Sometimes we only need to save individual part of an image. For example, when exporting to pdf, background text is saved to a file as a whole hi-res full-size page, but foreground photo as a lo-res colored part of the page.
This may require reworking the entire logic of the program.
Shouldn't we have some dialog somewhere with compression parameters? https://github.com/ImageProcessing-ElectronicPublications/scantailor-experimental/issues/4
For example, for coloured images we have LZMA which can be better than LZW
And for BW we can use JBIG or lossless JBIG2.
I mean not change default logic, just hide compression parameters somewhere.