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Milan Nikolic
2023-09-02 12:11:24 +02:00
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@@ -168,20 +168,34 @@ This is what it looks like in the PCManFM file manager:
### Examples
Rescale images to 1200px for all supported files found in a directory with a size larger than 60MB:
* Rescale images to 1200px for all supported files found in a directory with a size larger than 60MB:
`cbconvert --recursive --width 1200 --size 60 /media/comics/Thorgal/`
Convert all images in pdf to 4bit BMP images and save the result in ~/comics directory:
* Convert all images in pdf to 4bit BMP images and save the result in ~/comics directory:
`cbconvert --bmp --outdir ~/comics /media/comics/Garfield/Garfield_01.pdf`
`cbconvert --format bmp --outdir ~/comics /media/comics/Garfield/Garfield_01.pdf`
[BMP](http://en.wikipedia.org/wiki/BMP_file_format) format is a very good choice for black&white pages. Archive size can be smaller 2-3x and the file will be readable by comic readers.
Extract covers to ~/covers dir for all supported files found in the directory, Lanczos algorithm is used for resizing:
* Extract covers to ~/covers dir for all supported files found in the directory, Lanczos algorithm is used for resizing:
`cbconvert cover --outdir ~/covers --filter=7 /media/comics/GrooTheWanderer/`
* Convert all images to AVIF format:
`cbconvert --format avif --quality 50 --width 1280 --outdir ~/comics /media/comics/Misc/`
### Quality settings
This table maps quality settings for JPEG to the respective AVIF and WEBP quality settings:
| | | | | |
|--------------|----|----|----|----|
| JPEG quality | 50 | 60 | 70 | 80 |
| AVIF quality | 48 | 51 | 56 | 64 |
| WEBP quality | 55 | 64 | 72 | 82 |
### Compile
Install ImageMagick7 and libheif (with libaom) libraries and headers and then install to GOBIN: