maskData

Type

property

Summary

Specifies which pixels of an image are displayed.

Syntax

set the maskData of <image> to <binaryData>

Description

Use the maskData property to change the appearance of an image without changing its image data, or to examine the mask of the image.

Each pixel is represented by 8 bits (1 byte) of mask data, with pixels numbered from the top left corner of the image, left to right, then top to bottom.

Since each pixel is represented by 8 bits (1 byte or 1 character), you can obtain the numeric value for a given pixel using the charToNum function. For example, the numeric value of the maskData for the tenth pixel is given by the expression charToNum(char 10 of the mask of image).

A value of zero means the pixel is fully transparent; any other value means the pixel is fully opaque. Unlike the alphaData property, the maskData stores only complete transparency or complete opacity, and does not support partial transparency.

Examples

put the maskData of image "Download" into dataToAnalyze

Related

control structure: function

glossary: property, pixel, binary, mask, expression

keyword: image

property: pixels, windowShape, alphaData

Compatibility and Support

Introduced

LiveCode 1.1

OS

mac

windows

linux

ios

android

Platforms

desktop

server

mobile