A possible vImage bug ?
A possible vImage bug ?
- Subject: A possible vImage bug ?
- From: Peter <email@hidden>
- Date: Mon, 8 Mar 2004 11:27:26 +0800
Hello,
I am testing the vImage library. Since there is no mailing list
regarding vImage or performance computing, I am posting here to
cocoa-dev since I do part coding in cocoa. Perhaps Apple should set a
mailing list for performance computing which covers vector libraries
and other optimizing issues.
I have been testing the function, vImageScale_Planar8 for resizing a
single gray image TIFF. However my tests reveals whenever image is
resize either larger or smaller, the image does not fit in the new
height scale. However width resizing (by X) has no problem. For example
if the image is enlarge by 20%, the new image is enlarge but move the
image up (by Y) leaving a visible blank lines at the bottom.
When the image resize into a smaller size, the opposite happens. The
smaller image is moved downward by Y Axis leaving a visible blank
lines at the top. If the image is resize at ratio 1:1, there is no
changes. I am testing this on Mac OS 10.3.2 with Power Mac G4 733mhz.
Has anyone encounter this problem before ?
I am thinking of submitting this as a bug.
Thanks.
Peter
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