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 [1]
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
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 <tony@imager.perl.org>