[digiKam-users] why is batch convert to bw so extremely slow?

[Maik Qualmann]

Saving large PNG files takes so long, Gimp is not faster either. Are you sure 
you saved it as a PNG in the editor and not as a JPG? If versioning is active, 
"Save changes" creates a JPG depending on the setting, which is very fast. If 
you want to have a JPG in BQM, you have to attach the tool for saving in JPG 
at the end of the tools.

Maik

Am Dienstag, 30. Juni 2020, 20:11:56 CEST schrieb Daniel Bauer:
> Hi,
> 
> Sometimes I'd like to convert a complete album to bw. I added 69 color
> png of 30-40MB to a batch, selected convert to bw, save in new folder, run.
> 
> Each image takes more tan 2 minutes to convert. When I open it in
> editor, and click color->bw it works immediately, also saving the file
> is fast. But batch processing is so slow that it cannot be used.
> 
> Now I must go through the album in editor, click color->bw->save->next
> 68 times, which is not comfortable but at least 10 times faster :-(
> 
> Why?