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png-verify.pl: use Unit PixelsPerCentimeter

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This commit is contained in:
Dietmar Maurer 2016-11-10 16:39:35 +01:00
parent 097aa949df
commit 9798ad65e7
2 changed files with 9 additions and 8 deletions
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9
png-cleanup.pl
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@ -12,11 +12,12 @@ my $outfile = shift ||
# use the following to verify image attributes
# identify -verbose <filename>
# set DPI to 146, so that we can display 1024 pixels (page width)
# set PixelsPerCentimeter to 58, so that we can display 1024
# pixels (page width)
my $dpi = 146;
my $dpcm = 58;
system("convert -units PixelsPerInch $infile -density $dpi $outfile");
system("convert -units PixelsPerCentimeter $infile -density $dpcm $outfile");
# identify should return the same value
# system("identify -units PixelsPerInch -format '%x x %y' $outfile");
# system("identify -units PixelsPerCentimeter -format '%x x %y' $outfile");

8
png-verify.pl
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@ -6,11 +6,11 @@ use warnings;
my $infile = shift ||
die "no input file specified\n";
my $dpi = 146; # expected
my $dpcm = 58; # expected
my $tmp = `identify -units PixelsPerInch -format '%x x %y' $infile`;
my $tmp = `identify -units PixelsPerCentimeter -format '%x x %y' $infile`;
die "got unexpected DPI density '$tmp' (fix with png-cleanup.pl)\n"
if $tmp ne "$dpi x $dpi";
die "got unexpected density '$tmp' (fix with png-cleanup.pl)\n"
if $tmp ne "$dpcm x $dpcm";
exit 0;