- Support by method
- File format large sample support
- Filter larger sample support
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.
Support by method
Method Support Notes ------ ------- ----- arc Partial  box Partial  circle Partial  convert Full copy Full crop Full difference Full filter Partial Depends on the filter. flip Full flood_fill Partial  getpixel Full getsamples Full getscanline Full map None masked Full matrix_transform Full paste Full polygon Partial  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>
 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
 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
Tony Cook <email@example.com>