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Date Posted: 17:32:17 05/14/01 Mon
Author: Michel
Subject: Re: How to access Pixel's RGB information fast
In reply to: ktv 's message, "How to access Pixel's RGB information fast" on 11:11:38 05/14/01 Mon


Hi,

With TBitmap, the only way to access the pixels fast is to use the ScanLine property. It may be used for formats other than 24 bit, but it is difficult to use, because the layout of the bytes is sensitive to the image format.

For example, a black and white image, each bit represents a pixel. For 256 colors, each byte represents a pixel on a scan line.

The TBitmapGraphic class (and all classes derived from TDibGraphic) have an RGB property, which works the same way, no matter the image format. It is a little slower than ScanLine, but much faster than using the Pixels.Canvas property.

Best regards,

Michel

>Hi,
> I have a TBitMap, and I want to access all of its
>Pixels'
>RGB information. TBitMap.Canvas.Pixels[x,y] is slowly
>so I
>want to use TBitMap.ScanLine, but someone say that
>TBitMap.ScanLine can only be used under pf24bit, while
>my
>BitMap maybe pf8bit pf16bit, pf24bit and so on. So
>what can
>I do to solve the problem?

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