mtPaint is a simple painting application that was designed to help you create pixel art and manipulate digital photos.

mtPaint uses the GTK+ toolkit (version 1 or 2) and runs on PC's via the GNU/Linux or Windows operating systems. Because of its simplicity it can also run on older PC hardware (e.g. a 200MHz CPU and 32MB of RAM).

Features:

Interface:
· Toggle the toolbars on or off at the touch of a button.
· Horizontal or vertical split view mode.
· Pixel grid for guidance at high levels of zoom.
· Move the mouse pointer with exact precision using the arrow keys.
· Extensive shortcut keys used to improve productivity.
· 12 Image clipboard.
· Up to 1000 undo steps.
· Zoom levels between 10% and 2000%.
· Pan window for quickly navigating a large image, or at a high zoom.
· Browse different files passed at the command line.
· Translations: Chinese (Simplified), Chinese (Taiwanese), Czech, Dutch, English (UK), French, Galician, German, Italian, Japanese, Polish, Portuguese, Portuguese (Brazilian), Russian, Slovak, Spanish, Swedish, Turkish.
· Use a pressure sensitive graphics tablet.
· Limit memory used for undo images.
· Grab screenshots.

Pixel Art:
· Edit indexed palette or RGB images.
· Save and load BMP, GIF, JPEG, LSS, PNG, TGA, TIFF, XPM, XBM files.
· Extensive palette features - load, save, sort, edit, posterize, quantize, remove duplicate colours, remove unused colours, colour protection, palette shifting.
· Image channels: Alpha, Selection, Mask. All saved to a PNG file.
· Up to 100 layers.
· Create animations by moving layers, or shifting palettes.
· Create animated GIF's using Gifsicle.
· 81 brush presets.
· 100 brush patterns.
· User defined gradients.
· Copy and paste using rectangle or polygon shapes.
· Tools to shuffle pixels, flood fill, draw straight lines, smudge, clone, paste text, draw/fill rectangle/ellipses.

Image Manipulation:
· Quickly transform image gamma, brightness, contrast, saturation, hue, posterize from a single dialog, and preview the results in real time.
· Apply various effects such as invert, greyscale, isometric transformations, edge detect, sharpen, unsharp mask, soften, Gaussian blur, emboss, bacteria.
· Use gamma correction on effects to improve the quality of various effects.
· Crop at the touch of a button.
· Resize the canvas.
· Rescale the canvas, enlarging or reducing, using several filter methods.