How To: remove the certain color from a bitmap then save the separated part

Hi,

I'm using leadtools v13.

ColorSeparate method can separate the bitmap by color plane to produce one grayscale bitmap per plane. But  I want to remove the red color while keep the original palette. And I also want to save the removed part into a new bitmap just like only copy the red color from the original bitmap.

Is there any way to do this ?

Thanks

rick

Please explain in more details what you're trying to do.

Do you want to identify pixels
that are in the red range of colors, or do you want to work with all pixels that have a red component?

For example, the color RGB(200,
10, 10) is in the Red range, although it's not pure red. On the other hand, the
color RGB(255, 250, 240) contains much more of the Red component, but it is not in the Red range at all.

Also, are you working with  images that have 8 bits per pixel or less? If
not, the images would not have palettes in LEADTOOLS. If you are working with
palettized images, is it a requirement that the original image's palette be completely preserved with no changes at all?

About removing the red color, what
exactly do you want to put in its place? Do you want to fill the affected parts with a certain color such as black?

I would also like to know which LEADTOOLS programming interface (OCX, .NET classes, DLL API, C++ Classes, etc.)

I think it should be the first way I want to deal with the bitmap (identify pixels those are in the red range of colors).

For example, as the images attached is concerned, I use method colorseparate(RGB) to process "original.bmp" , then I get red plane("ColorSep.bmp"). It looks like we "remove" the red color pixels from the bitmap.

Now I want to save the "removed" red pixels into a new bitmap. In another word, we need to create a new bitmap with same width and height against the original. Then we pick up the certain color (range) pixels from the original bitmap and fill them with the certain color in new bitmap.

There's nothing further need to be done with removed color in original bitmap.Method colorseparate works well. And It's not a requirement that the original image's palette should be completely preserved with no changes.

I use leadtools 13 main ocx and com. My dev tool is VB6.

Thanks

rick

File Attachment(s):

sample.rar (26kb) downloaded 28 time(s).

You can use the following code:

 Dim io As New LEADRasterIO

   Dim proc As New LEADRasterProcess

   io.Load LEADRasterView1.Raster, "original.bmp", 0, 1, 1

   MsgBox 1

   LEADRasterView2.Raster.CreateBitmap
LEADRasterView1.Raster.BitmapWidth, LEADRasterView1.Raster.BitmapHeight, LEADRasterView1.Raster.BitmapBits

   proc.Fill LEADRasterView2.Raster, vbWhite

   LEADRasterView1.Raster.SetRgnColorHSVRange -25, 80, 90, 25, 255, 255, L_RGN_SET

   proc.Combine LEADRasterView2.Raster, 0, 0,
LEADRasterView1.Raster.BitmapWidth, LEADRasterView1.Raster.BitmapHeight, LEADRasterView1.Raster, 0, 0, CB_DST_0 + CB_OP_ADD

   proc.Fill LEADRasterView1.Raster, vbWhite

It works!

Thank you very much.

Rdgs,

rick