Convert sld to pnm Online: sld2pnm

You can use Tom's Editor to easily convert images from
AutoCAD slide file .SLD to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

SLD

AutoCAD slide file is an image format with extension SLD.

PNM

PNM images are uncompressed 24 bit RGB images. Can cannot store Alpha channel. PNM images come in 2 types: binary and text. Especially popular on Linux.