tif compression issue

[Gilles Caulier]

Hi,

Tiff codec is the same between Editor and BQM. Compression is Deflate
if i remember.

BQM TIFF settings are independent from Editor.
You have the Queue default settings for TIFF when you process existing
files without exporting to another format/another file.
You have the BQM tiff export tool settings if you export to a new file
(your case).

The compression result must be the same between Editor and BQM. What
happens if you turn off compression in the tiff export tool ? Does it
compress ?

Bes

Gilles Caulier

Le mar. 19 déc. 2023 à 15:24, <leoutation at gmx.fr> a écrit :
>
> Hi
> I convert many big png files to tif format with Digikam. I noticed tif
> compression is not the same when i convert with batch tool and Digikam
> editor. Tif compression is set everywhere in my preferences
> Example
> with digikam batch tool :  55.5 MB png -> 135 MB tif
> with digikam editor:         55.5 MB png -> 60.9 MB tif
> Compression with editor is better, batch conversion is unusable for me,
> files are too big.
> I'm wondering which kind tif compression is used in Digikam, LZW,
> Deflate ? It could be a good thing to have the choice. 'Deflate' should
> be the best. I use it with Gimp, compression is slower but files are smaller
> Conditions: Arch Linux system, Digikam git
>
> --
> Maderios