Size and power ratio of backpattern images
sanke at hrz.uni-kassel.de
Mon Oct 9 15:58:09 CDT 2006
On Sun Oct 8, Kevin Miller <kevin at runrev.com> in a mutilated response
to an unknown request with subject "no subject" wrote:
> Pattern images can be color or black-and-white. To be used on Mac OS
> systems, patterns must be 128x128 pixels or less, and both its height and
> width must be a power of 2. To be used on Windows and Unix systems, height
> and width must be divisible by 8.
> Does that explain it?
At first I thought Kevin was somehow referring to icons (?), but the
docs state the same for images as backpatterns:
> Cross-platform note: To be used as a pattern on Mac OS systems, an
> image must be 128x128 pixels or less, and both its height and width
> must be a power of 2. To be used on Windows and Unix systems, height
> and width must be divisible by 8. To be used as a fully cross-platform
> pattern, both an image's dimensions should be one of 8, 16, 32, 64, or
Well, seems to me that an obsolete state of things is being described here.
Presently I am experimenting with an add-on to my "Imagedata Toolkit"
that creates "seamless tiles" of various sizes and 3 different
algorithms (with 5 options each for the overlapping areas) to create the
tiles. A test button shows the resulting pattern in whole-screen preview.
I experience no limitations so far on MacOS and on Windows concerning
the size of the images or constraints of divisibility. Backpattern
images can be of a size of 500X300 pixels - or *any* other size - on
MacOS and Windows and can have indivisible ratios for example of 151 X 259!
So I am wondering to what Kevin is referring?
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