/ 
Imager-0.41
/ Imager::Color
Security Advisories (6)
CVE-2016-1238 (2016-08-02)

Imager would search the default current directory entry in @INC when searching for file format support modules.

CVE-2007-2459 (2007-05-02)

Heap-based buffer overflow in the BMP reader (bmp.c) in Imager perl module (libimager-perl) 0.45 through 0.56 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted 8-bit/pixel compressed BMP files.

CPANSA-Imager-2014-01 (2014-01-03)

When drawing on an image with an alpha channel where the source minimum is greater than zero, Imager would read from beyond the end of a malloc() allocated buffer. In rare circumstances this could lead to some of the source image not being written to the target image, or possibly to a segmentation fault.

CVE-2024-53901 (2024-11-17)

"invalid next size" backtrace on use of trim on certain images

CVE-2006-0053 (2006-04-10)

Imager (libimager-perl) before 0.50 allows user-assisted attackers to cause a denial of service (segmentation fault) by writing a 2- or 4-channel JPEG image (or a 2-channel TGA image) to a scalar, which triggers a NULL pointer dereference.

CVE-2026-8669 (2026-05-15)

Imager versions through 1.030 for Perl allow a heap out of bounds (OOB) write on crafted multi-frame GIF files. Imager::File::GIF's i_readgif_multi_low allocates a single per-row buffer GifRow sized for the GIF's global screen width 'SWidth' and reuses it across every image in the file. The page-match branch validates Image.Width + Image.Left > SWidth before each DGifGetLine write, but the parallel skip-image branch at imgif.c:790-805 calls DGifGetLine(GifFile, GifRow, Width) with no such check.

NAME

Imager::Color - Color handling for Imager.

SYNOPSIS

$color = Imager::Color->new($red, $green, $blue);
$color = Imager::Color->new($red, $green, $blue, $alpha);
$color = Imager::Color->new("#C0C0FF"); # html color specification

$color->set($red, $green, $blue);
$color->set($red, $green, $blue, $alpha);
$color->set("#C0C0FF"); # html color specification

($red, $green, $blue, $alpha) = $color->rgba();
@hsv = $color->hsv(); # not implemented but proposed

$color->info();

DESCRIPTION

This module handles creating color objects used by imager. The idea is that in the future this module will be able to handle colorspace calculations as well.

new

This creates a color object to pass to functions that need a color argument.

set

This changes an already defined color. Note that this does not affect any places where the color has been used previously.

rgba

This returns the rgba code of the color the object contains.

info

Calling info merely dumps the relevant colorcode to the log.

You can specify colors in several different ways, you can just supply simple values:

  • simple numeric parameters - if you supply 3 or 4 numeric arguments, you get a color made up of those RGB (and possibly A) components.

  • a six hex digit web color, either 'RRGGBB' or '#RRGGBB'

  • an eight hex digit web color, either 'RRGGBBAA' or '#RRGGBBAA'.

  • a 3 hex digit web color, '#RGB' - a value of F becomes 255.

  • a color name, from whichever of the gimp Named_Colors file or X rgb.txt is found first. The same as using the name keyword.

You can supply named parameters:

  • 'red', 'green' and 'blue', optionally shortened to 'r', 'g' and 'b'. The color components in the range 0 to 255.

    # all of the following are equivalent
my $c1 = Imager::Color->new(red=>100, blue=>255, green=>0);
my $c2 = Imager::Color->new(r=>100, b=>255, g=>0);
my $c3 = Imager::Color->new(r=>100, blue=>255, g=>0);

  • 'hue', 'saturation' and 'value', optionally shortened to 'h', 's' and 'v', to specify a HSV color. 0 <= hue < 360, 0 <= s <= 1 and 0 <= v <= 1.

    # the same as RGB(127,255,127)
my $c1 = Imager::Color->new(hue=>120, v=>1, s=>0.5);
my $c1 = Imager::Color->new(hue=>120, value=>1, saturation=>0.5);

  • 'web', which can specify a 6 or 3 hex digit web color, in any of the forms '#RRGGBB', '#RGB', 'RRGGBB' or 'RGB'.

    my $c1 = Imager::Color->new(web=>'#FFC0C0'); # pale red

  • 'gray' or 'grey' which specifies a single channel, from 0 to 255.

    # exactly the same
my $c1 = Imager::Color->new(gray=>128);
my $c1 = Imager::Color->new(grey=>128);

  • 'rgb' which takes a 3 member arrayref, containing each of the red, green and blue values.

    # the same
my $c1 = Imager::Color->new(rgb=>[255, 100, 0]);
my $c1 = Imager::Color->new(r=>255, g=>100, b=>0);

  • 'hsv' which takes a 3 member arrayref, containting each of hue, saturation and value.

    # the same
my $c1 = Imager::Color->new(hsv=>[120, 0.5, 1]);
my $c1 = Imager::Color->new(hue=>120, v=>1, s=>0.5);

  • 'gimp' which specifies a color from a GIMP palette file. You can specify the filename of the palette file with the 'palette' parameter, or let Imager::Color look in various places, typically "$HOME/gimp-1.x/palettes/Named_Colors" with and without the version number, and in /usr/share/gimp/palettes/. The palette file must have color names.

    my $c1 = Imager::Color->new(gimp=>'snow');
my $c1 = Imager::Color->new(gimp=>'snow', palette=>'testimg/test_gimp_pal);

  • 'xname' which specifies a color from an X11 rgb.txt file. You can specify the filename of the rgb.txt file with the 'palette' parameter, or let Imager::Color look in various places, typically '/usr/lib/X11/rgb.txt'.

    my $c1 = Imager::Color->new(xname=>'blue') # usually RGB(0, 0, 255)

  • 'name' which specifies a name from either a GIMP palette or an X rgb.txt file, whichever is found first.

  • 'channel0', 'channel1', etc, each of which specifies a single channel. These can be abbreviated to 'c0', 'c1' etc.

  • 'channels' which takes an arrayref of the channel values.

Optionally you can add an alpha channel to a color with the 'alpha' or 'a' parameter.

These color specifications can be used for both constructing new colors with the new() method and modifying existing colors with the set() method.

AUTHOR

Arnar M. Hrafnkelsson, addi@umich.edu And a great deal of help from others - see the README for a complete list.

SEE ALSO

Imager(3) http://www.eecs.umich.edu/~addi/perl/Imager/