SPR files

From Creatures Wiki

(Redirected from .spr)

The .spr Sprite image file extension is associated with Creatures 1. These files store a number of images with 8-bit color, so each COB usually only needs one SPR file. They can be viewed and with BoBCoB Sprite Editor, and previewed in Windows using GreenReaper's Sprite Thumbnail Viewer.

[edit] Overview

An SPR file consists of three distinct parts:

A header, containing information about the file
Image headers, one for each image
The image data

[edit] File header

uint16: Number of images in the file

[edit] Image header

Then, for each image, there is an image header containing:

uint32: Offset to beginning of first line in image data
uint16: Image width in pixels
uint16: Image height in pixels

[edit] Image data

For each of the specified number (i.e. image width * image height) of pixels in each image:

uint16: Reference to palette colour id, one byte, 0 to 255

The actual image data is simply color indexes arranged into horizontal scanlines. The mappings between color indices and 256 RGB colors is given in the PALETTE.DTA file; Multiply the red, green and blue results returned by 4 to gain the full colour range.