Legacy ImageMagick Discussions Archive

what I'm doing:
1.get one frame from a gif picture(we call it Frame f) using CloneImage function;
2.change some pixels of Frame f;
3.save the Frame f;

then, my problem is :

If I save the Frame f as jpg, everything is OK,
but if I save the Frame f as gif, my changes(done in step 2) does not work, the output gif is the same as the orginal Frame(got in step 1)

and I want to get a gif format output, how should I do?

Your original image is PseudoClass (colormapped). You have the choice of either changing the color of one or more colormap entries or if you want to change a single pixel, first promote the image to DirectClass (e.g. SetImageStorageClass()).

thank you so so much!
it does work!

magick wrote:Your original image is PseudoClass (colormapped). You have the choice of either changing the color of one or more colormap entries or if you want to change a single pixel, first promote the image to DirectClass (e.g. SetImageStorageClass()).