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5.1 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
- 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.
- Light_correct
- 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
Light_correct.
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.
Click on White_balance.
- Smooth_image
- Use this to remove texture from images. It's handy in conjunction with
the Light_correct item.
Apply this item to an image to make a smoothing widget, open up the
row, and move the slider to select the size of feature you want to
remove.
- Calibrate_chart
- Use this to make a colour calibration image. Apply to a cropped RGB
image of a Macbeth Color Checker Chart to make a calibrated CIELAB
image. sInside the row you'll see metrics on calibration quality,
and the calculated transform.
- Calibrate_image
- Use this to apply the transform calculated by the previous item to
another image. Select the calibrated chart image, select the RGB image
you want calibrated, and click Calibrate_image.
Next: 5.2 Colour
Up: 5. Image processing menus
Previous: 5. Image processing menus
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John Cupitt
2003-07-21