Imager::LargeSamples - track/document large sample support
# 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
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.
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.
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 1, 8, 16
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 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
Tony Cook <tonyc@cpan.org>