Create B/W (a filter plug-in for Adobe Photoshop™ 3.0)
Free 68k version 1.0.0. Copyright 1996 Hugh Kawahara. All rights reserved.
§ 0. Quick Start (This section should be enough for most people.)
0.1 Distribution Policy (Yes, it's free!)
This 68k version is a freeware. Please read § 1 for the detail.
0.2 System Requirement
Any Macintosh computer running Adobe Photoshop™ 3.0.0 or later.
0.3 Installation
Move the entire "Create_B_W" folder into the "Plug-ins" folder in your "Adobe Photoshop™"
folder. (Re)Start Photoshop. It will appear under the menu "Filter->colleen".
0.4 What It Does
It works on RGB images only. It creates gray scale images from RGB images. It lets you adjust
the ratio of red, green, and blue in the gray scale image. It also adjusts the contrast and the
brightness of the image. The plug-in does not change the image mode.
0.5 Usage
Use the red, green, and blue sliders to adjust the ratio. The default is R = 30%, G = 59%, and
B = 11%. The plug-in automatically adjusts the sum to be 100%. The plug-in creates a small
thumb nail preview in the dialog box for quick preview and a full size preview window over
the original image window. Both previews are zoomable and scrollable and the full size
preview is resizable. The original image window still exists behind the full size window.
Use the "Glass" and "Hand" tools in the dialog box to zoom in/out or scroll the previews.
Double click to the toolbox fits/zoom-in the thumb nail preview. Double click while holding
down the option key fits/zoom-in the full size preview. Hold down the option key and click on
the "Cancel" button to reset the ratio to the default ratio.
0.6 How to Reach the Author
Please send comments, bug reports, etc. to <kawahara@leland.stanford.edu>.
Visit <http://www.stanford.edu/~kawahara> for updates.
User's Guide
This part is provided for completeness.
Some part may be too technical for some people.
Contents
1. Distribution Policy and Legal Stuff
2. System Requirement
3. Installation
4. What It Does
5. Usage
6. Misc. Notes
7. How to Reach the Author
8. Acknowledgment
§ 1. Distribution Policy and Legal Stuff
This particular version (the version is specified at the top of this document) is a freeware.
Other versions may not be.
You may distribute this software freely as far as no parts of the contents of the folder
"Create_B_W", which includes this memo "Create_B_W.doc" and the plug-in
"Create_B_W.68k", are deleted or modified.
The author retains the copyright.
This software is provided "as is".
The author shall not be liable for any damages or losses caused by this software in any way.
§ 2. System Requirement
Hardware:
Macintosh computer with a MC68020 processor or greater, including Power PC.
Math co-processor (FPU) is NOT required.
Software:
System 7.0 or greater.
Adobe Photoshop™ 3.0.0 or greater.
Since Photoshop 3.0 requires MC68020 and System 7.0, any Macintosh computers running Photoshop 3.0.0 or greater should be sufficient to run this plug-in.
It will not work with prior versions of Photoshop.
§ 3. Installation
Simply move, copy, or drag the entire "Create_B_W" folder containing the plug-in and
this memo into the "Plug-ins" folder in your "Adobe Photoshop™" folder.
Quit Photoshop if it is running. Then (re)start Photoshop.
It will appear under the menu "Filter->colleen".
§ 4. What It Does
4.1 Image Mode
RGB images only.
4.2 What It Really Does
The most usual way of converting RGB color images to gray scale images is
to mix the red, green, and blue with 30:59:11 ratio.
This plug-in allows you to adjust this ratio manually.
Photoshop's mode change to gray scale seems to be using some fixed ratio similar to this
(It seems to convert it to the Lab mode first, then take the Lightness channel).
Desaturating the RGB image mixes the color with 1:1:1 ratio and does not look good.
The plug-in creates a 512 (instead of 256) level gray scale image first using the ratio,
then apply contrast and brightness adjustments and reduce it to 256 levels.
Hopefully, it would leave more room for the adjustments.
§ 5. Usage
5.1 Invocation
Simply choose "Create B/W…" from the menu "Filter->colleen".
After applying this filter, convert the image to the appropriate image mode, if necessary.
This plug-in does NOT change the image mode.
5.2 Adjusting the Ratio of Red, Green, and Blue
Use the "Red", "Green", and "Blue" sliders to adjust the ratio.
The plug-in automatically adjust the sum to be 100%.
5.3 Adjusting the Contrast and Brightness
Use the "Contrast" and "Brightness" sliders.
5.4 Resetting the Ratio to the Default
Clicking the "Cancel" button while pressing the option key resets the ratio to the default.
It does NOT change the "Contrast" and "Brightness" setting.
5.5 Previews
The plug-in creates two previews. One is a small thumb nail in the dialog box
and other one is a full size preview over the original image window.
The full size preview window is a separate window from the original image window.
To view the original image, just drag the preview window.
Both previews are zoomable and scrollable. The full size preview is resizable too.
Use the "Glass" tool to zoom-in/out the preview. Use the "Hand" tool or the scroll bars
to scroll the preview. Press the option key to zoom out. Press the command key to zoom in.
The maximum zoom-in ratio is 1:1 at this moment.
To choose a tool, click the toolbox in the dialog window.
Double click the "Hand" tool to fit the thumb nail preview to the preview area.
Press the option key while double clicking to fit the full size preview to the window.
Double click the "Glass" tool to zoom in the thumb nail preview to 1:1 ratio.
Press the option key while double clicking to zoom in the full size preview.
The double clicks do not resize the window .
(Note: The thumb nail preview is "buffered" for quick refresh.
Any zooming or scrolling may take some time to re-buffer the data from Photoshop, if the image is large.)
§ 6. Misc. Notes
Enjoy!
§ 7. How to Reach the Author
Please send comments, bug reports, etc. to <kawahara@leland.stanford.edu>.
Visit <http://www.stanford.edu/~kawahara> for updates.
§ 8. Acknowledgment
This software was developed using
Metrowerks CodeWarrior Academic 7 and
Adobe Photoshop 3.0.4 SDK.
Adobe Photoshop is a trademark of Adobe Systems, Inc..
Macintosh is a trademark of Apple Computer, Inc..
Metrowerks CodeWarrior is a trademark of Metrowerks, Inc..
