Convert to bitonal image

[LanceMcHatton]

Ok, my total time in RD is about 1 hour so far so please excuse what is probably a basic question.

I'm doing my best to convert raster lines to ACAD lines but it's not working as easily as it did with the sample images. I guess I need to convert my image to a bitonal image but I can't find how to do that. Right now the image has white, black, and red (and probably millions of variations of each since it's a regular scanned image).

Can someone point me in the right direction or tell me if I'm even on the right path?

Thanks

[rkmcswain]

Image | Image Processing | Change Color Depth

[LanceMcHatton]

Image | Image Processing | Change Color Depth
Thanks, McSwain!

Ok, that changed it to just black and white, no in-betweens. But I lost the red and that's the one I needed. I understand there's a way to work with the image to "extract" just one color out of it. Where would that be?

[Railrose]

Thanks, McSwain!

Ok, that changed it to just black and white, no in-betweens. But I lost the red and that's the one I needed. I understand there's a way to work with the image to "extract" just one color out of it. Where would that be?
The only thing I can think of would be to make 2 copies of the image with different names. Change one to a bitonal image & put it over the colored image. The bitonal image will be transparent & let you see the colored imge. That will give you the bitonal to snap to & the colored one to use as a guide.

[rkmcswain]

Thanks, McSwain!

Ok, that changed it to just black and white, no in-betweens. But I lost the red and that's the one I needed. I understand there's a way to work with the image to "extract" just one color out of it. Where would that be?

A bitonal image contains 2 colors, black and white. Assuming your background color is black, you will only see the "white" parts of the image. The "white" parts of the image will actually be the color of the layer on which the image resides. Move the image to a red layer, and the visible parts are now red.

[Railrose]

A bitonal image contains 2 colors, black and white. Assuming your background color is black, you will only see the "white" parts of the image. The "white" parts of the image will actually be the color of the layer on which the image resides. Move the image to a red layer, and the visible parts are now red.
I was under the impression that he has 3 colors: black, white, & red. As in a redlined drawing.

[rkmcswain]

I was under the impression that he has 3 colors: black, white, & red. As in a redlined drawing.

That may be true, but a bitonal image can only display two colors.

[Railrose]

That may be true, but a bitonal image can only display two colors.
That's the reason to overlay the bitonal version on the color version. It gives you the chance to see the difference between the black & red lines.