slackbuilds/graphics/qiv/README

qiv (Quick Image Viewer)

Quick Image Viewer (qiv) is a very small and pretty fast GDK/Imlib
image viewer. Features include zoom, maxpect, scale down, fullscreen,
brightness/contrast/gamma correction, slideshow, pan with keyboard
and mouse, rotate left/right, flip, delete (move to .qiv-trash/),
jump to image x, jump forward/backward x images, filename filter, and
you can use qiv to set your X11-Desktop background.

These formats are supported by default:

GIF TIFF XPM PNG PPM PNM PGM BMP JPEG SVG ICO TGA ICNS WMF[*]

[*] If .wmf files won't load for you, make sure you've updated
    Slackware recently (e.g. "slackpkg upgrade-all").

Optional supported formats:

Format                  | Optional dependenc(y|ies)
------------------------+-----------------------------------------------
PCX                     | pcx-pixbuf-loader
------------------------+-----------------------------------------------
PSD (PhotoShop native)  | gdk-pixbuf-psd
------------------------+-----------------------------------------------
WEBP                    | imlib2 webp-pixbuf-loader. Build and
                        | install *in that order*.
------------------------+-----------------------------------------------
XCF (Gimp native)       | xcf-pixbuf-loader
------------------------+-----------------------------------------------
RAW (camera images,     | libopenraw. Note that only a few raw image
    various extensions) | formats will actually display with qiv. These
                        | include .crw (Canon), .erf (Epson), and
                        | .nef (Nikon).
------------------------+-----------------------------------------------

These are runtime dependencies, so they can be installed at any time
without rebuilding qiv.

To easily build all the optional dependencies, use sbopkg with the
qiv-allfmt.sqf in the SlackBuild directory.