AIMP Forum

AIMP for Windows => Вопросы / Questions => Topic started by: xeo on January 24, 2025, 19:16:57

Title: Cover image always copies as png
Post by: xeo on January 24, 2025, 19:16:57

When I copy cover image in the tag editor and paste it again, it always pastes as png. Same thing in ATE. It should keep a copied/original format.

(https://i.imgur.com/UCnJnpa.gif)

Title: Re: Cover image always copies as png
Post by: Artem on January 26, 2025, 19:37:10

Yes, this is correct behavior. PNG is almost optimal file format for all cases

Title: Re: Cover image always copies as png
Post by: xeo on January 26, 2025, 20:07:24

I believe that the JPG format is quite sufficient for the covers, PNG is much bigger. It shouldn't convert format without asking user and copied/original format should be kept.

Title: Re: Cover image always copies as png
Post by: Artem on January 26, 2025, 21:10:13

Quote from: xeo on January 26, 2025, 20:07:24

I believe that the JPG format is quite sufficient for the covers, PNG is much bigger. It shouldn't convert format without asking user and copied/original format should be kept.

Jpeg is lossy, each re-saving reduce the quality. additionally, it does not support transparency

Title: Re: Cover image always copies as png
Post by: xeo on January 27, 2025, 01:14:39

It depends what quality is set for saving jpg. I just tested some covers and if set 95 quality value (original quality) and saved many times (10), there is no visual difference (no noise or color change). Only the size of the file has decreased (once), but without losing quality. Besides, who needs transparency in covers...

Title: Re: Cover image always copies as png
Post by: Gruko on January 27, 2025, 16:30:12

Is it possible to increase the compression factor of the PNG format?

The difference in size is not great, but you can save some disk space.

Title: Re: Cover image always copies as png
Post by: xeo on January 27, 2025, 20:42:50

Quote from: Gruko

Is it possible to increase the compression factor of the PNG format?

Yes, but probably with visible loss of quality.

Quote from: Gruko

The difference in size is not great, but you can save some disk space.

You can save a lot of disk space (comparing to png) using jpg (set to 95 quality value).

Title: Re: Cover image always copies as png
Post by: Artem on January 27, 2025, 22:27:42

Quote from: xeo on January 27, 2025, 01:14:39

It depends what quality is set for saving jpg. I just tested some covers and if set 95 quality value (original quality) and saved many times (10), there is no visual difference (no noise or color change). Only the size of the file has decreased (once), but without losing quality. Besides, who needs transparency in covers...

Some Image Editors / Viewers has ability to save JPEG without lossy quality. AIMP uses GDI+ that does not have this feature.

Quote from: Gruko on January 27, 2025, 16:30:12

Is it possible to increase the compression factor of the PNG format?

Not via built-in features of GDI+.

Quote from: xeo on January 27, 2025, 20:42:50

Yes, but probably with visible loss of quality.You can save a lot of disk space (comparing to png) using jpg (set to 95 quality value).

I've a small wrapper around png quant utility that can reduce quality (and size) of png image without visible loss of quality.
https://github.com/ArtemIzmaylov/PNGQuantGUI