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The Fatted Calf
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ImageViewer
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README
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1993-05-13
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Welcome to ImageViewer 0.9i
===========================
ImageViewer is a freeware application that gives you the ability to display
and convert between a multitude of image formats. Among the supported formats
are:
atkras Andrew Rasterfiles (binary and ascii) read
gif Graphics Interchange Format read
itex ITEX Framegrabber Files read write
pbm Jef Poskanzer's Portable Bitmaps (binary) read write
pgm Jef Poskanzer's Portable Graymaps (binary) read write
ppm Jef Poskanzer's Portable Pixmaps (binary) read write
jpg JPEG File Interchange Format (JFIF) read write
macp MacPaint Documents read write
mtek Mikrotek Scanner Files read
eps PostScript Encapsulated Files read write
ps PostScript (plain) write
ras Sun Rasterfiles read write
rle UTAH Run-length Encoded Rasterfiles read
icon Sun Icon Files (old and new format) read write
tiff Tagged Image File Format read write
face USENET Face Files read write
xbm X11 Bitmaps read write
ilisp Xerox Interlisp-D Source read
brush Xerox Brush/Press Files read
ais Xerox Array of Intensity Samples read
ImageViewer is built around a general image reader/converter/writer that
automatically identifies the type of each image by examining the contents of
the file. File types (extensions) are only used if the content detector
fails. The displayed images can be scaled, resized, and copied to the
pasteboard as TIFFs, but that's pretty much all.
To change the size of an image, bring up the inspector panel and type in the
new width and height (in pixels). You can also scale it proportionally by
entering a single scale factor in the scale field, or two factors (X and Y)
separated by a slash. Note that either of these operations will only change
your view of the image. If you save it, it will still be in its original
size.
This version of ImageViewer also includes a minimal image filtering service
that can translate the listed formats to TIFF. The service will automatically
be activated when any application that uses the NXImage object and wants to
import an image file but doesn't understand the format. Try it by installing
ImageViewer in ~/Apps or /LocalApps and drag a non-TIFF image into an Edit
window or a Mail message. You should see the icon turn into the real image
inside the Edit/Mail window after a short delay. Note that you haven't
changed the image file itself, ie. if you send that message, you're really
sending the original image file, not a TIFF version of it.
Some nits:
Because ImageViewer nominally can create TIFF files with non-standard
bits/sample that currently are unreadable on a NeXT, there is a switch in the
preference panel that will avoid this problem by always creating TIFFs with
bits/sample values that are powers of two. It is recommended that you always
have this turned on, as the difference in saved storage space is minor.
The print function will normally produce output suitable for your chosen
printer. However, there are some circumstances under which it may create
color PostScript while you only want grayscale. To avoid this, check the
preference marked "Print using grayscale". (This used to be more of a problem
under 2.X, so you probably won't need to worry about it.)
There is now a default compression choice for TIFF images in the preference
panel. Changing this will cause all TIFFs that you save to use the chosen
compression. Note that colormapped images can only be saved with without
compression; choosing either LZW or JPEG will cause the images to be
automatically converted to grayscale or RGB before being saved.
Sorry, alpha (transparency) is still not supported. Images will alpha will
receive a white background and lose their transparency.
What about "image"?
"image" is a standalone command line converter based on the same conversion
engine as ImageViewer. Please see the supplied man page for instructions on
how to use it.
Changes since the last version (0.9e or so):
* Enabled optimized code that converts 8 bit CLUT images to 24 bit RGB. The
code was already there, just not used (sigh). This will make ImageViewer
decode all 8 bit CLUT images (eg. most GIFs) about 2x faster.
* Made ImageViewer recognize and claim .GIF and .JPG files (with capitalized
file types).
* Added a trivial image filtering service that translates typed filenames
to NXTIFFPboardType. Worked around a limitation in services that maximizes
the number of send types to 16 by splitting up the declarations in batches.
* Fixed bug in code using NXStreams that left image files mapped into memory
even after they were closed. This should make ImageViewer much less of a
memory hog.
* Fixed a bug in the decoding of ASCII PGM images. The checkers are now
correctly sized.
* Fixed a bug in the code that demultiplies alpha out of 12 bit TIFF images.
No more weird golf playing tints.
* Added minimal GIF89a support and fixed a bug in the extensions processing
code. Mostly the same as before; main difference is that comment fields will
be printed on stderr.
* Fixed byte ordering dependencies (two if I remember correctly). Fat (m68k,
i386, NRW) compiles now work like a charm.
* Removed Rainbow support. I don't think anybody uses it anyway.
* Added minimal support for Windows BMP file format (does this work?)
* Fixed swapped 16 bit input bug in Utah RLE decoder.
* Made tiff decoder choose richest representation for multipart tiff files.
(Yes, it would be nice to be able to keep them all, but my internal
image representation can't handle it. Sorry.)
* Fixed bug in grayscale resampling code (im_togray) that caused some printed
images to come out really aweful.
* Fixed some bugs that caused the right side of printed images to be
truncated. Also reduced the margins.
* Added a max window size preference that will limit new windows to the given
width and height. ShrinkWrapped images will be scaled while ScrollViews
will be clipped to conform.
* Added a default compression preference to be used when saving TIFF files.
Choosing anything else than "None" will cause NeXT's native TIFF routines to
be used instead of my own homebrew code.
Disclaimer:
This is unsupported freeware; if it works, it works, if it doesn't, it
doesn't. Give it to anyone you like, but please don't charge for it. I
don't. Feel free to let me know about any problems, but please don't rely on
them being fixed.
ImageViewer is an application that I put together on my spare time while
working at Rank Xerox EuroPARC. It is not a product of, nor condoned by NeXT
Inc. in any way. Please don't bother them about problems or questions.
(Etc, etc. I think you get the general gist.)
Enjoy,
Lennart Lovstrand
California, May 1993
lenlo@al.org, Lennart_Lovstrand@NeXT.COM