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##
5.8.1 Capture

This menu groups operations which are useful in capturing images, or for the inital processing you might want to do to an image captured from another program.

`Capture Video Frame`
  This menu item will currently only work on Linux machines with a compatible video4linux capture card. See §3.2.1 for notes on how it works.

`Smooth`
  Use this to remove texture from images. It's handy in conjunction with `Flatfield`.

`Flatfield`
  Use this to correct homogeneity. Select an image of a piece of white (or mid-grey) card, then select the image to correct, then click `Flatfield`. Use `Smooth` to renmove texture from the white card if necessary.

  You can select a single white and a group of images to correct a large set in one step

`White Balance`
  Use this to move the white point to make an area of the image you know to be white, white. Mark a region on an image, enclosing a patch you know to be white. Select the region and the image and click on `White Balance`.

`Find Colour Calibration`
  Use this to colour calibrate an image. Drag a region enclosing an image of a Macbeth Color Checker Chart and click `Find Colour Calibration`.

`Apply Colour Calibration`
  Use this to apply the transform calculated by the previous item to another image. Select the calibration object, select the RGB image you want calibrated, and click `Apply Colour Calibration`.

Next: 5.8.2 Mosaic Up: 5.8 Tasks Previous: 5.8 Tasks Contents