transparent colours for images

  • Thread starter Thread starter wanwan
  • Start date Start date
W

wanwan

I'm trying to make the background of a picture transparent, so I use
paint to fill the background with blue (0,0,255), then set the
transparent colour to it. I found a custom control that can do the
job.

Now the problem is the paint program can't seem to save the file with
the exact colour i need. every time I open the picture file again , I
see the blue background has a range of colours (<30,<30,>230)

I tried in Java and I was able to set a range of colours transparent.
How do I do it with vb.net?
I will need to have the image in the picturebox control at the end.
 
I'm trying to make the background of a picture transparent, so I use
paint to fill the background with blue (0,0,255), then set the
transparent colour to it. I found a custom control that can do the
job.

Now the problem is the paint program can't seem to save the file with
the exact colour i need. every time I open the picture file again , I
see the blue background has a range of colours (<30,<30,>230)

I tried in Java and I was able to set a range of colours transparent.
How do I do it with vb.net?
I will need to have the image in the picturebox control at the end.
Click to expand...

If you are saving the image as a JPG you may lose the EXACT colour you
want to use. I think png image format is much better for this sort of
thing. TIFF images would also work but would be quite large.
 
Also, the .jpg graphic format doesn't support transparency. Another format
that would is the .gif format, but it can really make a good looking graphic
look awful if you aren't careful in how you create it.

Bruce
 
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