This is the mail archive of the cygwin-apps mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: 256x256 px icons


On 8/15/2011 9:44 AM, Charles Wilson wrote:
On 8/15/2011 10:33 AM, Warren Young wrote:
The hard edges in the original art are causing stair-stepping when doing
a direct downsample, though.  (Look at the pointy bits.)  By blurring
the high-res version and then downsampling by a non-integral amount, you
can get a much smoother result.

This is only the case if the "downsample" operation used by GIMP, when d/s by an integral amount, is to simply pick every Nth pixel. That's very fast -- but is not the correct operation (I'd posit a GIMP bug, in fact).

Perhaps Gimp did that in the past, but what you're describing is now Gimp's "None" interpolation mode. Both it and Photoshop have better resampling modes, but they all give some stair-stepping with hard diagonal lines if you don't give it a bit of help.



Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]