tools/check_image_resolutions.sh

   1 #!/bin/sh
   2 #
   3 # check_image_resolutions -- find image files with resolution != 144x144 dpi
   4 # Copyright (C) 2009 The GIMP Documentation Team.
   5 # License: GPL
   6 #
   7
   8 usage="Usage: ${0##*/} DIR [DIR ...]"
   9 programs="find xargs identify awk"
  10
  11 die() {
  12     exitcode="$1"; shift
  13     echo >&2 "$*"
  14     exit $exitcode
  15 }
  16
  17 # Check command line arguments
  18 if [ -n "$1" ]; then
  19     for arg; do
  20         test -d "$arg" || die 65 "No such directory: $arg"
  21     done
  22 else
  23     die 64 "$usage"
  24 fi
  25
  26 # Check for required programs
  27 for prog in $programs; do
  28     type $prog >/dev/null 2>&1 || die 69 "Missing program: $prog"
  29 done
  30
  31 # Start
  32 find "$@" -name .git -prune \
  33           -o \( -name *.png -o -name *.jpg \) -print | \
  34 xargs identify -format "%d/%f %x %y %wx%h\n" | \
  35 sort | \
  36 awk '
  37     BEGIN {
  38         n = 0; m = 0;
  39         c[0]="|"; c[1]="/"; c[2]="-"; c[3]="\\";
  40         print("Checking image files for potential resolution problems...");
  41     }
  42     # Input:
  43     #     $1  -  file name (incl. path)
  44     #     $2  -  x resolution (ok: 56.69, 56.70, 143.*, 144.*)
  45     #     $3  -  x units (e.g. "PixelsPerInch", "Undefined", ...)
  46     #     $4  -  y resolution
  47     #     $5  -  y units
  48     #     $6  -  <width>x<height>
  49     # Example:
  50     #     path/to/image.png 56.69 PixelsPerCentimeter \
  51     #         56.69 PixelsPerCentimeter 273x303
  52     /./ { ++n }
  53     /./ && ($2 !~ /^(56\.|14[34])/ || $4 !~ /^(56|14[34])/) {
  54         ++m;
  55         if ($2 != $4) {
  56             printf("%s (%s): %sx%s [%s]\n", $1, $6, $2, $4, $3)
  57         } else {
  58             printf("%s (%s): %s [%s]\n", $1, $6, $2, $3)
  59         }
  60     }
  61     END {
  62         printf("  Total: %d    Suspects: %d\n", n, m);
  63     }
  64 '
  65