Version 13 of Image manipulation without Tk

[Explain motivation (cron, possible sneer at Java, portability, ...]

[Explain alternatives:

utility X server
Xvfb [L1 ]
VNC
TclDG [L2 ]
Image [L3 ]
Xbit [L4 ]
xwd
Pure Tcl solutions. An example DKF offered is

  #! /usr/local/bin/tclsh8.3
  puts "Content-Type: image/x-portable-graymap"
  puts ""
  puts "P2"                          ;# ASCII PGM "magic number"
  puts "10 10"                       ;# width and height
  puts "18"                          ;# Max grey value
  for {set i 0} {$i<10} {incr i} {
     set line ""
     for {set j 0} {$j<10} {incr j} {
        lappend line [expr {$i+$j}]
     }
     puts $line
  }
  exit

A small and incomplete TGA image reader which reads a file into a format that can then later be fairly easily manipulated without the requirement of Tk. The format is compatible with one of the accepted (albeit undocumented) formats for Tk photos.

See: TGA image reader.

See also "strimj - string image routines" and "barchart". GIF has code snippets for writing image files in pure Tcl.

[Do something about Tk's "-nodisplay" ...]

Arts and crafts of Tcl-Tk programming - Category Graphics