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Readme PICTcompare
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1994-11-21
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PICTcompare
____________________________________________________________
Using this program, you can compare PICT files, and find out if they
are identical, or at least very similar. The program works on all PICT
files, including Quicktime compressed pictures.
PICTcompare also identifies two pictures when
- one of them is grayscale
- they don't have the same size / aspect ratio
- they have a different intensity
- they have a different pixel-depth
- and when one of them is blurred
PICTcompare works best on digitized images, like scanned photos.
Using PICTcompare
____________________________________________________________
The simplest operation is to use the 'Search Folder' command on any folder
containing PICT files. Then PICTcompare loads all needed information and
compares all pictures with each other. If the pictures are compressed,
this may take a while. The name of the current picture processed is
displayed at the bottom of the main dialog. When PICTcompare has finished
it's task, it displays a list of similar pictures, sorted by the "compare value",
which means the most similar pictures are at the top of the list. This
compare value is also displayed within the main dialog.
See the reference section for more information about the other commands
and the vect resources.
Limitations:
- Only 1000 pictures may be compared with each other.
- Only 200 found pictures will be display.
Reference
____________________________________________________________
File Menu
- Load Master
Load a master image for the following compare operations.
- Compare with Folder
Compares all images within this folder (and all subfolders) with the
master image set using the 'Load Master' menu command.
- Search Folder
Compares all images within this folder with each other. (Doesn't
use the master image)
- Preferences
Limit value :
This sets the limit for a compare operation. The lower the
value, the more the same they have to be. Absolut identical pictures
have values between 0 and 10, picture that are most likely the same
have values between 11 and 20. Sometimes there are similar pictures
with values over 20, therefore a good limit value is between 25 and 30.
Add vector resource :
When checked, the compare information (202 bytes!) of each picture is added
within the picture as a 'vect' resource (id 128). The next time PICTcompare
needs to compare this picture, it just loads this resource and does not
have to load the whole image. If the pictures are compressed, this
makes it a LOT faster.
- Remove Vect Resources
Removes the vect resources from all pictures found within this folder.
(and subfolder)
Version History
____________________________________________________________
1.b0
- inital public release (beta, because I am the only one who really tested it!)
1.1
- FAT binary : Full PowerPC support!
____________________________________________________________
I made PICTcompare, because my archive of pictures got much to big!
I couldn't tell which picture I already had, and which not. Therefore I thought,
let the computer do the work, and compare all pictures for me.
I did various of tests and PICTcompare always found the pictures that
were more or less the same.
If you have any problems, ideas or suggestions, please contact me!
This program is PostcardWare. Therefore, if you use and like it, please
send me a postcard!
Oliver Dreer
Im Egg 35
4147 Aesch
Switzerland
Internet : odreer@iiic.ethz.ch (until Summer 1995)