Imagecopymerge takes a part of the overlaid or "source" image, from src_x and src_y to a hight and width defined by scr_w and src_h. dst_x and dst_y are the x and y coordinates at which the top left corner of the overlaid image will begin. "pct" is the percent transparency of non-transparent areas of the overlaid "source" image.
For adding a faint logo over an art print to deter copying, try a pct number below 50, but high enough to be visible. For a solid image, such as placing a cropped image of a person onto a photo of an exotic location, try 100 for a solid image... or make them appear as a "ghost" using something like "40" or "50".
Try experimenting with the variables a bit to see how your results may vary. The image below was achieved by the combining of the same images as above, but using "50" for the value of "pct", instead of "100".
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