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TWAIN Plug-in Copyright (C) 1999 Craig Setera Craig Setera <firstname.lastname@example.org> 03/31/1999 Updated for Mac OS X support Brion Vibber <email@example.com> 07/22/2004 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. Based on (at least) the following plug-ins: Screenshot GIF Randomize Any suggestions, bug-reports or patches are welcome. This plug-in interfaces to the TWAIN support library in order to capture images from TWAIN devices directly into GIMP images. The plug-in is capable of acquiring the following type of images: - B/W (1 bit images translated to grayscale B/W) - Grayscale up to 16 bits per pixel - RGB up to 16 bits per sample (24, 30, 36, etc.) - Paletted images (both Gray and RGB) Prerequisites: Should compile and run on both Win32 and Mac OS X 10.3 (possibly also on 10.2). Known problems: - Multiple image transfers will hang the plug-in. The current configuration compiles with a maximum of single image transfers. - On Mac OS X, canceling doesn't always close things out fully. - Epson TWAIN driver on Mac OS X crashes the plugin when scanning. Debugging: There are two different versions of the program included, a standard version and a version built for debugging. The debugging version is a special version capable of capturing the TWAIN datasource data to a file for later processing. This feature can be used to create a data dump that can be sent to me if for some reason the plug-in fails for your TWAIN datasource. The function of the plug-in is controlled by the name of the executable file. The plug-in should be placed in your plug-ins directory and named as follows: twain.exe - This is the standard (non-debugging) version. This file will not behave differently if renamed. This version is intended to be used unless your TWAIN datasource has some problem. gtwain.exe - This is the debugging version of the program shipped along. If this program is used as named, it will behave the same as "twain.exe" except that the file C:\twain.log will be written. This file is a text file with very little information available for debugging. dtwain.exe - Renaming "gtwain.exe" to "dtwain.exe" in your plug-ins directory will change the behavior of the plug-in. The menu option will be registered as "TWAIN Acquire (Dump)..." and will cause the TWAIN acquire operation to be dumped to the file "C:\twaincap.bin". This file contains all of the data necessary to recreate the capture on another system (such as my machine). The image will not be displayed, as it might cause the plug-in to crash making the data useless. Instead, a message will be displayed that the image information was dumped to a file. rtwain.exe - Renaming "gtwain.exe" to "rtwain.exe" in your plug-ins directory will change the behavior of the plug-in. The menu option will be registered as "TWAIN Acquire (Read)..." and will cause the TWAIN acquire operation to read a previously dumped (using dtwain.exe) TWAIN acquire from "C:\twaincap.bin". If you find that you are unable to capture data from you datasource (the plug-in crashes or the image is wrong), please capture data using the following steps: 1) Copy gtwain.exe to your plug-ins directory as "dtwain.exe". 2) Run GIMP. 3) Choose Xtns->TWAIN Acquire (Dump)... 4) Choose the datasource settings that are causing problems. 5) Choose a *SMALL* sample image. 6) Zip up "C:\twaincap.bin" and "C:\twain.log" and send them to me.