On Sunday, May 9, 2004, at 05:20 AM, Webmaster - Dreamscape Software wrote:
I'm a little confused about imageData. How would I create an image, using
imageData, with whatever colors I wanted for each pixel?
The image is a sequence of pixel values in row and column order. The pixels of the topmost row are first. Within each row, the pixels are left-to-right.
The sequence is binary, that is, your value string should be interpreted as a sequence of bytes. Each four bytes or characters represent a pixel. The first byte of the pixel data is zero. The next three bytes represent the RGB value, one byte for each color component. Each color component is represented by a number from 0 to 255. Extract it with charToNum() and build it with numToChar(). (Note: Because some images have image-wide color settings such as gamma, two images with the same pixel value might not display the same, but see setting method below.)
At this time, using 'put ... into ...' for each pixel or color component to build imageData values can be slow. Try to use 'put ... after ...'. That is, do this when you can build your imageData from front to back. (There is an enhancement request in for a feature that will help.)
If you change the size or shape of the image, you must handle that when you set the imageData.
Here is one way:
set the text of me to empty set the height of me to pHeight set the width of me to pWidth set the imageData of me to pImageData
Using crop might also work.
Dar Scott
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