''GPS'': This is a fun script that makes gradients:

  #! /usr/local/bin/wish8.3

  set im [image create photo -width 600 -height 768]

        for {set i 1} {$i < 256} {incr i} {
        set col [format "%2.2XFFFF" $i]        
        $im put "#$col" -to 0 $i 600 [expr {$i + 1}]
        }

        for {set i 1} {$i < 256} {incr i} {
        set col [format "FF%2.2XFF" $i]        
        set yi [expr {$i + 256}]
        $im put "#$col" -to 0 $yi 600 [expr {$yi + 1}]
        }

        for {set i 1} {$i < 256} {incr i} {
        set col [format "FFFF%2.2X" $i]        
        set yi [expr {$i + 512}]
        $im put "#$col" -to 0 $yi 600 [expr {$yi + 1}]
        }
        
        
  pack [canvas .c -bd 0 -height 768 -width 600] 
  .c create image 300 384 -image $im -tag im
  .c bind im <Button-1> {puts [$im get %x %y]}

------

[uniquename] 2014jan27

For those who do not have the facilities or time to implement the code above,
here is an image that shows the single Tk 'photo' image put on a Tk 'canvas'.

[colorGradients_3pastels_canvas-create-photo-put_wiki1289_351x713.jpg]

For another method of making color-gradients in rectangles, see the
wiki page [Making color gradients]. The technique there uses stacks
of many thin Tk 'frame' widgets.



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