05-11-2013
Why didn't (or even: don't) you post a meaningful, comprehensive example of your file? No surprise the proposals fail. On the sample you supplied the proposal does work satisfyingly.
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LEARN ABOUT DEBIAN
imager::largesamples
Imager::LargeSamples(3pm) User Contributed Perl Documentation Imager::LargeSamples(3pm)
NAME
Imager::LargeSamples - track/document large sample support
SYNOPSIS
# make a large sample image
my $im = Imager->new(..., bits => 16);
# call some method
my $result = $im->$method(...);
# was the image modified at its full sample size
DESCRIPTION
Imager has had in-memory support for large samples for years now, but many methods still don't work at the higher sample size when supplied
with a large sample image.
This document will track which methods support large samples and which don't, for future improvements.
Support by method
Method Support Notes
------ ------- -----
arc Partial [1]
box Partial [2]
circle Partial [1]
convert Full
copy Full
crop Full
difference Full
filter Partial Depends on the filter.
flip Full
flood_fill Partial [1]
getpixel Full
getsamples Full
getscanline Full
map None
masked Full
matrix_transform
Full
paste Full
polygon Partial [1]
polyline None
read Partial See L<File format large sample support>
read_multi Partial See L<File format large sample support>
rotate Full
rubthrough Full
scale Partial Some qtypes support large samples
scaleX None
scaleY None
setpixel Full
setscanline Full
string Full Preserves large samples, but most font drivers
generate 8 or fewer bits of levels of coverage.
transform None
transform2 None
write Partial See L<File format large sample support>
write_multi Partial See L<File format large sample support>
[1] filling an area using the fill parameter works at the full depth of the image, using filled => 1 and color works at 8-bits/sample
[2] box() will fill the area at the supplied color, but outline at 8-bits/sample.
File format large sample support
Format Format samples Imager support
------ -------------- --------------
BMP 8 8
GIF 8 8
ICO 8 8
JPEG 8, 12 8
PBM 1 1
PGM/PPM 1-16 read any, writes 8, 16
PNG 1, 2, 4, 8, 16 8
RAW 8
SGI 8, 16 8, 16
TGA 8 8
TIFF (many) read/write 8, 16, 32 contig rgb/grey images
read/write bi-level
read/write 4/8 paletted images
Filter larger sample support
Filter Large sample support
------ --------------------
autolevels No
bumpmap No
bumpmap_complex No
contrast No
conv Yes
fountain Yes
gaussian Yes
gradgen No
hardinvert Yes
mosaic No
postlevels No
radnoise No
turbnoise No
unsharpmask Yes
watermark No
AUTHOR
Tony Cook <tonyc@cpan.org>
perl v5.14.2 2011-06-06 Imager::LargeSamples(3pm)