tif compression issue

[leoutation at gmx.fr]

On 12/19/23 15:54, Gilles Caulier wrote:
> 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 ?
If i turn 'off' compression in  batch/BQM tiff export tool, i get 135 MB
tif file, exactly same with compression 'on'.
Compress tif setting doesn't work
>
> 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

--
Maderios