Now that I’ve got all my icons into the image library (see my recursive image library creation post) I wanted to limit the number of times I need to go back to an image editor to mess with the original files to create variations. One of the most common variations for button icons is the greyed out disabled icon so I wrote a little rev plugin to greyscale the selected images.
The plugin uses the following command:
on greyscale pImageID local tImageData, tRed, tGreen, tBlue, tGrey, tOffset,tWidth,tHeight lock screen put the width of pImageID into tWidth put the height of pImageID onto tHeight put the imageData of pImageID into tImageData repeat with tOffset = 0 to tWidth *tHeight * 4 step 4 put charToNum(char tOffset + 2 of tImageData) into tRed put charToNum(char tOffset + 3 of tImageData) into tGreen put charToNum(char tOffset + 4 of tImageData) into tBlue --correction for better greyscale from Mark --put (tRed+tGreen+tBlue) div 3 into tGrey put (tRed*30+tGreen*59+tBlue*11) / 100 into tGrey put NumToChar(tGrey) into char tOffset + 2 of tImageData put NumToChar(tGrey) into char tOffset + 3 of tImageData put NumToChar(tGrey) into char tOffset + 4 of tImageData end repeat set the imageData of pImageID to tImageData end greyscale
download: greyscaleIt (1.19KB) added: 04/09/2010
description: This is a quick little plugin I wrote for converting selected images to greyscale. Handy for creating disabled icons from active ones.