Add compress option for save png

[jPV]

Interesting. As you mentioned PPaint, I checked it and it seems that it is the only program on Amiga which let you set png compression level.

There are others too, like Art Effect.

Tried to save the clown.pic example from PPaint in PNG format (compression level default 6) and here is the result:

PPaint PNG (6) - 46272 bytes
PPaint PNG (9) - 46252 bytes

Loaded the file and saved in PNG from ImageFX and Hollywood and here is the interesting part:

ImageFX PNG - 106489 bytes
Hollywood PNG - 102389 bytes

I saved the clown.pic from PPaint with Art Effect, there are compression levels from 0 to 9 in it.

ArtEffect PNG (0) - 192662 bytes
ArtEffect PNG (6) - 106532 bytes
ArtEffect PNG (9) - 106029 bytes

[airsoftsoftwair]

I saved the clown.pic from PPaint with Art Effect, there are compression levels from 0 to 9 in it.

ArtEffect PNG (0) - 192662 bytes
ArtEffect PNG (6) - 106532 bytes
ArtEffect PNG (9) - 106029 bytes

In other words, Hollywood is even better than the best compression level in ArtEffect

[jPV]

In other words, Hollywood is even better than the best compression level in ArtEffect

Yeah Only thing I can think that is there any use for non-compressed PNG images in some situation? But otherwise I don't see much point changing anything...

[airsoftsoftwair]

Code: Select all

- New: Inbuilt image savers for IFF ILBM, PNG, and BMP also support saving palette-based images now; this
  will result in images being smaller than when saved as 24-bit as it was previously always the case; but
  of course there is a maximum of 256 colors for palette-based images; furthermore, IFF ILBM and PNG
  savers also support pen-based transparency now