Raster images

Formats that store a picture as a grid of pixels, each with its own colour. They suit photographs and screenshots. Most compress the grid, some without losing anything and some by dropping detail the eye is unlikely to miss.

Formats

.BMP

OS/2 bitmap array (BA)

Several OS/2 bitmaps, icons or pointers for different screens, chained in one file.

.BMP

Windows bitmap (BM)

Windows bitmaps: a header, an optional palette and rows of pixels.

.GIF

Graphics Interchange Format

Palette images of up to 256 colours, LZW compressed, often animated.

.ICO

OS/2 colour icon (CI)

A colour OS/2 icon: a 1-bit mask bitmap followed by a colour image.

.ICO

OS/2 icon (IC)

A black and white OS/2 icon: AND and XOR masks in one 1-bit bitmap.

.JPG

JPEG image

Lossy compressed photographs, in marker segments with JFIF or Exif metadata.

.PNG

Portable Network Graphics

Lossless raster images with transparency, stored in CRC-checked chunks.

.PTR

OS/2 colour pointer (CP)

A colour OS/2 mouse pointer: masks, a colour image and a hotspot.

.PTR

OS/2 pointer (PT)

A black and white OS/2 mouse pointer, with its hotspot in the header.

.TIFF

Tagged Image File Format

Flexible tagged images for print, scanning and archives, often multi-page.

.WEBP

WebP image

Google’s web image format: lossy, lossless or animated, in RIFF chunks.