[Digikam-users] Re: Store image as AdobeRGB

Marcel Wiesweg marcel.wiesweg at gmx.de
Thu Dec 2 11:57:05 CET 2010


> Hm, maybe you could tell me where I would have to look excatly for the
> color profile? I did not try jpg or png yet.

The right sidebar, Color / Profile is the right place. Any wrong information 
there is a bug.

> I'm still looking for some
> good master format to save my images during my editing workflow. Until now
> I thought about jpg2000 or tiff. Any other recommanedations?

There are four in the choice of lossless file formats: PNG, TIFF, JPEG2000, 
PGF.
PNG and TIFF will result in pretty large files: TIFF is often not compressed 
at all, and PNG uses a simple compression scheme (you get  small files if 
there are large parts in the same color, like charts or diagrams, obviously 
not for real-life photos). Advantages of TIFF and PNG: widely supported - you 
can pass files around to your friends - and low computation when loading / 
saving (but when files are larger, harddisk access takes longer, I dont know 
if they really load and save faster)
JPEG2000 and PGF are technically superior, modern file formats, based on 
Wavelet transformation. Both support lossy and lossless encoding. Lossy 
encoding will give better results than JPG, and lossless will give smaller 
files than PNG or TIFF. JPEG2000 is optimized for compression ratio, PGF is 
much faster, giving only slightly larger files AFAIK. The only drawback of 
these formats is that they are not as widely supported as JPG, PNG or TIFF, 
PGF probably even less then JPEG2000.

Marcel


More information about the Digikam-users mailing list