Gahaku

Gahaku is an image viewer for professionals running on OS X. Gahaku can display pixel values of an image in various color spaces, i.e., RGBA, HSL, HSB, Y'PbPr, linear RGB, XYZ, xyY, Lab and Luv. It can also provide histogram, waveform, and vectorscope panels which help you to investigate comprehensive image information.

Gahaku is a simple and fast image viewer, which can support those who analyze images both in technically and scientifically, especially for engineers, researchers, teachers, designers, and artists.

Gahaku supports the image formats that OS X supports, including 8-bit and 16-bit image, such as, PIC, PICT, HDR, EXR, MAC, PNT, PNTG, TARGA, TGA, CUR, XBM, BMP, ICO, PSD, ORF, MRW, RWL, RAW, RW2, RAF, CRW, ICNS, EFX, JFAX, JFX, G3, FAX, TIF, TIFF, DCR, ERF, ARW, SR2, SRF, PEF, NRW, NEF, 3FR, FFF, MOS, CR2, DNG, JPF, JP2, GIF, JPE, JPEG, JPG and PNG.

You can quickly browse images with keyboard shortcuts like a popular image viewer, the IrfanView, does (just in case, Gahaku is a viewer and cannot edit images, while the IrfanView can do a lot of things.).