TImage and reduced color depth image manipulation
lazarus / 31-LCL

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reb · 2019-07-14 14:13

Hello,

I want to store monochrome images in TImage class. I have attempted to
set Image.Picture.Bitmap.PixelFormat:= pf1bit. Regardless of the pixel
format set, values are always stored as 24 bit RGB (it seems like it).
At first glance it seems to be not possible because
image.Picture.Bitmap.Canvas.Pixels[] always sets and gets TColor.

How can I go about manipulating and displaying 8 bit greyscale and 1
bit monochrome images?
If it is not possible, then how can I use RawImage with ricfGray?
Built in documentation didn't help much.

Thank you

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jamie · 2019-07-14 15:34

Not sure about Timages but, Tbitmap needs to have the Pixelformat :=
pf1bit; before you set the
size of it..

 I've never tried that with TImage so I am not sure there.

 Once done, you could covert it to a 24 bit and keep the monochrome
look.