Paste

Selecting ``Paste'' or clicking on the main ``Paste'' button activates a small dialog box that selects what will be pasted onto what. This provides a range of options useful for stenciling, adding labels, and creating mattes and composite images. Important: Both images must be the same depth (bits/pixel).

1. Background to transparent part of image -- copies pixels from the background into the image, only in regions of the image that are currently transparent. If transparency is ``off'', it does nothing.

2. Background to opaque part of image -- copies pixels from the background into the image, only in regions of the image that are currently not transparent. Note that if the chromakey bit of the image is ``on'', the image will suddenly blend in with the background and seem to disappear until chromakey is turned ``off''. Conversely, if chromakey is ``off'', it copies everything behind it, obliterating the original image.

3. Opaque part of image to background -- copies all pixels from the image onto the background unless they are transparent. This effect is identical to the main ``Paste'' button in the information area.

4. Transparent part of image to background -- copies the original, hidden pixels from the part of the image that is transparent onto the background. If chromakey is ``off'', it does nothing.

5. Stencil transparent part of image to background -- same as option 4, except that the pixels are all set in the current drawing color to create a stencil.

6. Entire image to background -- copies the entire, original image onto the background, regardless of any chromakey settings.

7. Add RGB to background - Sets the background red, green, and blue color values to be the sum of the foreground + background. A typical use would be in adding shadows. The foreground image would be thresholded, then reduced in contrast to create a gray figure on a black background. Color-invert the background, then add the foreground RGB values and color-invert the background again to create a dark shadow superimposed on the background image.

8. Paste opaque pixels if $>$ background - If the sum of red, green, and blue pixel values of the foreground image is greater than that of the background image, the pixels are pasted; otherwise the background is untouched.

9. Paste opaque pixels if $<$ background - If the sum of red, green, and blue pixel values of the foreground image is less than or equal to that of the background image, the pixels are pasted; otherwise the background is untouched.

Notes

• These operations do not create any new images. If the result is to be saved, it is necessary to use ``File..Create/Resize object'' to create a new image.
• The ``paste'' feature can also be used to paste between parts of images that are in separate windows, provided that they are properly superimposed.
• ``Paste'' and ``Copy/move'' do not utilize the X Window clipboard and cannot be used to copy between applications.
• If the source image is zoomed, the pasted portion of the image is converted to its original size before being pasted onto the destination. In order for pasting to work as expected, both foreground and background images must be zoomed by the same amount.