On Thu, 24 Jun 2010 06:04:57 am Branko Vukelic wrote: > On Wed, Jun 23, Philip Rhoades wrote: >> What is going on with these size increases? > It may be that after rotation, pixels that were > otherwise the same color got anti-aliased and were > slightly different color. This would increase the > image size.
Branco, that may account for the increased size of a _rotated_ image, but Phil also increased the size simply during a re-save of an unchanged image. Phil, I suspect that when re-saving that image, you may wish to check the Advanced Settings popup to ensure that the PNG compression ratio is set to maximum at the time. WRT the rotated image, it wouldn't so much be anti- aliasing as that the rotation is unlikely to be precisely right-angled, so pixels along edges would be partially coloured, which would make the PNG compression process less efficient. If the image is text or something else essentially monochrome, Phil might try desaturating, then (regardless of desat) Auto/Stretch Contrast. This should minimise colour-gradient effects somewhat, so provide for more effective compression. If minute details are not so important, saving as JPeG will reduce the size massively without serious loss of visual quality. Loss of quality can be adjusted to a reasonable compromise level within the JPeG settings during SaveAs. Cheers; Leon _______________________________________________ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
