Legacy ImageMagick Discussions Archive

Does MagickCore have means of testing if a given pixel is in a given region of the image (circle, polygon, ..) ?

Anthony: thanks for the explanation. I must admit I didn't get half of it :shock: but I'm sure it'll be useful to many who may face the same issue, and happen to be less ignorant than myself. :oops:
I tried your command, however, and it yielded a black background (as you predicted), which is, at ...

Thanks for the explanation.
I think there is more to it: XnView seems to think the background is white, too !



And FireFox, as well, displays a white background.

IM v6.4.0 04/17/08 Q16 under WinXP SP3 up to date.
Just to make sure, I downloaded and installed latest version (v6.6.7-Q16) in a VM.
I get the same characteristics (identify -verbose) for "result.tif", but that's not transparent background!

Look at this screenshot from Photoshop:

http://i52 ...

Thanks fmw42. I've been looking at the documentation for a while, to no avail.
With copy_opacity and dst_in, the white background pixels in pic.tif (which are black in mask.tif) remain white! They don't become transparent in result.tif.

I'm starting to believe IM can't do this simple task. I refuse ...

Hi,

Gereyscale "pic.tif" (8bit, 600dpi) and black & white "mask.tif" (1bit, 96dpi) are of the same size.
How can I make every black pixel in "mask.tif" transparent in "pic.tif" ? (pixel of the same coordinates, that is).

Thx.