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Help scale up an image without distorting it.

Posted on 2007-11-27
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Last Modified: 2010-04-21
Hi All.

I have a small bmp that i created. 4 pixels wide and 4 pixels high.  When i display it in a picture box i want to be able to actually see the pixels rather than just a dot on the screen so i say stretch.  The problem is that it smooths out the pixels and is not an exact representation of the image like i see in my image viewer.

Any ideas on how to display the exact 4x4 pixel image but say 100x100 so the top left pixel was copied actuall 25x25 pixels without coding it myself?  

Thanks
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Question by:asiminator
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Expert Comment

by:tcicatelli
ID: 20357486
A 4x4 bmp only has 16 pixels of information.  You can't expect to be able to stretch it to 100x100 (10,000 pixels) and maintain the same look.  Why don't you just recreate the bmp in the larger size?
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Author Comment

by:asiminator
ID: 20357587
im not sure you understand.  im only interested in 16 pixels.  I just want a zoom function like a have in gimp or picture viewer or paint or any other tool that lets you look at each pixel in a expanded view
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Accepted Solution

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Chris Stanyon earned 375 total points
ID: 20357829
You need to set the interpolation mode of the image, which I think you can only do in code. There doesn't seem to be a property for this in the designer.

In the paint event of the PictureBox add the following

        Dim PicWidth As Integer = 100
        Dim PicHeight As Integer = 100
        e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor
        e.Graphics.DrawImage(New Bitmap(Me.PictureBox1.Image), New RectangleF(0, 0, PicWidth, PicHeight))

This will 'zoom' into your image, rather than resizing it.

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Author Closing Comment

by:asiminator
ID: 31411178
the zoom seems to crop the left and the top of the image by about 10 pixels.  Not sure why...
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