Version 2, patchlevel 00 contained support for MacPaint, FBM, PGM,
PPM, CMU, Utah RLE and XWD image formats, gamma equalization, image
smoothing, and image rotation.  G3 FAX support was modified to cut
down on false positive identifications.  The zio subsystem was
modified to cache reads for performance improvements and to allow
stdin to be used as an input source.  Several loader functions which
did not properly close their files were fixed.  Color slideshows now
work.  Icon titles use an abbreviated titlebar title to enhance
readability.  The resource class name was changed from XLoadImage to
xloadimage to be more predictable.  Several options now propagate to
all images following them if the -slideshow option is specified.

Version 2.01 contained several fixes to window.c to work around a bug
in twm/tvtwm which could crash servers.  The resource class name was
changed (again) to Xloadimage to conform with standard class naming
practices.  Several problems with System-V compilation were corrected.
The gcc-1-37 make target was fixed to prevent a double-define.  The
GIF loader was patched to respond better to short GIF files.  The Utah
RLE image loader was patched to work with the updated ZIO package.

Version 2.02 added the options -default, -gray, -normalize, and
-private.  The memToVal routines were macro-ized for substantial speed
increases.  The atom used for deleting previously allocated colors for
the -onroot option was changed to correspond to that used by xsetroot.
Dithering and halftoning were changed to use a lookup table for
intensities to speed them up somewhat.  Rle.h was changed to use
memToValLSB() instead of its own byte-swapping algorithm for
portability.  Window.c was modified to eliminate the initial paint,
moving it instead to within ConfigureNotify.  A fix was made to xwd.c
to fix its colormap loader for out-of-order colormaps.  The G3 FAX
identification function was fixed and the G3 loader moved to prior to
the MacPaint loader so that both can be used.  A bug in send.c where
color images using the default colormap would not appear correctly if
the display depth was not a multiple of 8 was corrected.  The default
gamma value used in rle.c was changed from 2 to 1.  There were
miscellaneous portability changes.

Version 2.03 added -delay.  Many minor programming errors were cleaned
up.  Hash.c was changed to use image.h instead of local typedefs
(fixing a problem with PPM image loading).  Window.c was changed to
fix a problem with override redirect windows in fullscreen mode,
and refresh problems with some servers in slideshow mode were fixed.
Path.c was modified to ignore directories when searching for files.
Send.c was modified to allow TrueColor and DirectColor visuals.

Version 2.03-JPL contained interim code to handle 24-bit TrueColor and
DirectColor displays pending the release of Version 3.0.

Version 3.0 added full support for all server types.  Internal support
for 24-bit images was implemented (including the improvement of Sun
Rasterfile and PPM support to use the 24-bit format internally).  Many
modifications to image processing routines to support or make use of
24-bit images.  A much-improved colormap reduction algorithm replaced
the primitive one in previous versions.  The window display code was
modified to work with the best possible visual.  The window display
code was modified to use backing store when available (and -pixmap was
added to force the old technique).  The -fit option was added to force
an image to be fit into the default colormap if it didn't fit as
supplied.  The -fork option was added to allow automatic
backgrounding.  The -onroot -fullscreen options were modified to
preserve aspect ratio.  The -windowid option was added to allow the
setting of the background pixmap of any window.  The -onroot code was
modified to work with DECWINDOWS servers.  The -normalize option was
improved for color images.  The -slideshow option was removed (and
made the default behavior) and -merge was added to allow more flexible
image merging.  The WM_DELETE protocol is now recognized.  PC
Paintbrush (PCX) and GEM bitmap image formats are now supported.  The
GIF 89a signature is now recognized (although no support for its
additional capabilities has been implemented).

Version 3.01 corrected color problems when merging RGB files and fixed
a few small problems.

Version 3.02 fixed a -zoom bug for 24-bit images, a bug in the
imageOnRoot() function for DEC and NCD servers, and a couple of bugs
in merging and smoothing.

Version 3.03 added JPEG and color PCX image support and small fixes to
smooth() and normalize().

Version 4.0 added color PCX support, VICAR image support, NIFF image
support, -dump, -unhalftone, JPEG V4 and TIFF V3 integration, generic
filtering, and fixed a lot of bugs and minor build problems on some
systems.  Options are now handled in the order they are given rather
than a fixed order.  G3 FAX loader was removed because it was totally
unreliable.

Version 4.1 fixed a number of ANSI-C compilation problems, enhanced
the automated configuration to target HP and SGI machines
automatically, corrected a few minor bugs, and included the IJG JPEG
V4A code.