Built In Checkerboard WHITE/Gray instead of Gray/Darker Gray

[dfelder]

The built in checkerboard feature is great; however, the two colors are Gray and Darker Gray. For the highest contrast, Gray/White (or Black/White) would be preferred (like PhotoShop).

Is there a way to change this built-in pattern? I changed the checkerboard.png file in the Patterns folder, but that didn't do the trick.

Thanks.

[fmw42]

why not use the checkerboard as is and stretch the contrast using -level or -auto-level

convert -size 100x100 pattern:checkerboard -auto-level checker_black_white.gif

or

convert -size 100x100 pattern:checkerboard -level 25,75% checker_level25x75.gif

[dfelder]

The problem is that I'm layering it below a PNG image with transparencies, so i'm using the built in to facilitate the layering.

objMi.Composite "-compose", "Dst_Over", "-tile", "pattern:checkerboard", myimagename, myimagename

That's why I wanted to use a slightly different checkerboard to show the highest possible contrast when I thumbnail it.

[fmw42]

just create the checkerboard with contrast and save it as a temporary image, then use it in your composite. you can tile with any image.

[dfelder]

For a guy like me, it's easier said than done. LOL.

It took me a really long time to figure out how to add a stroke to an image, but I just got it all together. My solution is posted here: viewtopic.php?f=1&t=18307&p=70413#p70413

Final Solution:

Code: Select all

     objMi.Convert -size 100x100 pattern:checkerboard -auto-level checker_black_white.gif

     objMi.Composite "-compose", "Dst_Over", "-tile", "checker_black_white.gif", myimagename, myimagename

THANKS!!!

[anthony]

First checkerboard re-coloring. is as fred describes. normalize (auto-level) it first the use +level or +level-colors to re-color it as you like...

Code: Select all

  convert -size 60x60 pattern:checkerboard -auto-level \
          +level-colors red,blue     pattern_color_checks.gif

this is from Tiling, Modifying Built-in IM Patterns/Tiles
http://www.imagemagick.org/Usage/canvas/#pattern

The other problem is if you don;t want to read the tile from a disk file.
There are three solutions. MPR, clone-append, and distort
See Tiling with an Image already In Memory
http://www.imagemagick.org/Usage/canvas/#tile_memory

The first fits with using -tile the last generates canvases using tile (or distorted tiles)

[fmw42]

With Anthony's technique you can set the graylevels to anything you want (100 % white and 75% black, ie 25% white)

convert -size 60x60 pattern:checkerboard -auto-level \
+level 25,100% pattern_white_gray_checks.gif