bitmap punchout menu

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This menu lets you use a bitmap image to punch out pixels in another image. In this process, pixels in an image are replaced with a user-specified color if the corresponding pixels in a bitmap are part of the bitmap's background (i.e., not part of an object). This can be useful if you need to isolate a particular set of pixels for a detailed segmentation or texture analysis. The procedure for using this menu is as follows:

  1. You enter the name of the bitmap in the Bitmap menu field.
  2. You enter the name of the image you want to punch out. This can be a greyscale, color, or screen image.
  3. You specify the pixel value you want the punched-out pixels to get. Remember that black is 0 and white is 255.
  4. Click on PUNCH OUT IMAGE, then click on DISPLAY IMAGE to see the result.

When you are satisfied with your punched-out image, you can save it in one of three ways:

  1. You can click on SAVE NEW VERSION to create a new version of the image file. You can get the old version back by deleting the most recent version.
  2. You can click on OVERWRITE IMAGE to write the modified image data back into the original image file. This saves disk space, but the original image is irretrievable.
  3. You can enter a new name for the modified image in the New name menu field, and click on SAVE UNDER NEW NAME. The system will create a new image file with the new name, and load the modified image data into it. Your original image will still be available.