Gwenview is a fast and easy to use image viewer for KDE.

For more information see the Gwenview manual.

Krita is a powerful paint program for KDE. It's advanced capabilities allow you to modify image in many different ways.

KPDF is a KDE PDF viewer based on the xpdf code. Although being based on xpdf code, KPDF has some unique features like continuous mode, presentation support, etc.

For more information see the KPDF manual.

Kooka is a KDE application which provides access to scanner hardware using the SANE library. Kooka helps you scan, save your image in the correct image format and perform Optical Character Recognition (OCR) on it, using gocr, a popular open source OCR program.

For more information see the Kooka manual.

KSnapshot is a simple applet for taking screenshots. It is capable of capturing images of the whole desktop, a singe window or a selected region. The images can then be saved in a variety of formats.

For more information see the Ksnapshot manual.