>Rich....I have attempted to implement what I thought was your >suggestion. >I have stated it below. In trying to make my mask....I encountered a >problem. >I could not select a portion of my mask pattern to repeat by pasting >and anchoring. >Can you tell me what I might be doing incorrectly? > >Goal >Create a test pattern of 24 pairs of vertical lines (one black, one >of four colors) for an electronic sign 112 pixels wide and 48 pixels >high. The color lines of the pair are Red or Green or Blue, or White. >
You only asked about color-to-alpha and swapping black/white. However First the arithmetic does not work with Gimp. 112 pixels in 24 (pairs) = 4.66 pixels. You can not split pixels. Assuming you sort that out, I think you are over-complicating things. You can use Filters -> Render -> Pattern -> Grid to generate vertical black and white stripes 1 pair = 4 pix (2 + 2 ) I put up a set of guides = 28 to indicate the lack of match. example: https://i.imgur.com/5lAgF7f.jpg note the guides fall on pixel boundaries so are not all equal width. Sets of black/red , black/green , black/blue most easily done by adding coloured layers with those layers in 'multiply mode' Turn visibility on or off for colour, export as png's for individual images. example: https://i.imgur.com/A5ARfHj.jpg attached the xcf to play with. Attachments: * http://www.gimpusers.com/system/attachments/1054/original/rgb-b-w-stripes.xcf -- rich404 (via www.gimpusers.com/forums) _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
