How to limit the weight of an image to a specified amount of MB

[Remco Viëtor]

On mardi 24 septembre 2024 20:08:54 CEST Michel Cambron wrote:
> Bonjour  DigiKam Team,
> 
> Digikam has a feature to resize the image by modifying the number of
> pixels but is there a way to limit the final size of a jpeg ( export or
> transform) to a specified limit, example limit the size at 2.0 MB ?
> 
> I am using version 8.4 on Window 11.
> 
> Best regards,
> 
> Michel
As the amount of compression that can be obtained for a given quality level 
also depends on the image *content*, you cannot predict the final size of the 
resulting file. This is independant of the digikam version, or operating 
system, btw.

That said, some testing with a file with a large amount of details should give 
you a ball park figure. Keep in mind that the pixel size also has a large 
influence on the final file size: making the image twice as large requires 4x 
as many pixels (but that's before compression...)