Dithyr

Dithyr is an image processing program that lets you convert images to grayscale, reduce the colors in an image to a smaller palette size, dither the image using one of several algorithms, and swap the colors in an image to a new custom palette.

Features:

• Convert images to grayscale using one of 10 different methods
• Apply dithering using one of 3 techniques, including a technique (intermediate dithering) exclusive to this program
• Process images using one of 13 dithering algorithms, including error-diffusion algorithms like Floyd-Steinberg and matrix threshold algorithms
• Adjust brightness with optional gamma correction
• Create and save custom palettes of up to 12 colors, or use one of the included premade palettes from lospec.com

Version Comparison:

Feature	Dithyr Lite	Dithyr
Maximum Image Size	640x640	16384x16384
Maximum Palette Size	5	12
Save Custom Palettes	No	Yes
Grayscale Methods	Standard, BT.709, BT.601, Photoshop	Standard, BT.709, BT.601, Photoshop,  R, G, B, RG, RB, GB
Dithering Techniques	Reduce Only, Intermediate, Continuous	Reduce Only, Intermediate, Continuous
Dithering Algorithms	Standard, Linear, Floyd-Steinberg, Bayer 2x2, Bayer 4x4	Standard, Linear, Floyd-Steinberg, Jarvice-Judice-Ninke, Stucki, Atkinson, Burkes, Sierra, Sierra Two-Row, Sierra Lite, Bayer 2x2, Bayer 4x4, and Bayer 8x8
Gamma Correction	Yes	Yes
File Types	.png	.png, .jpg/.jpeg, .webp