This function coverts a picture into a greyscale image with 256 grey levels.
Greyscale images have up to 256 different levels of grey. You will find further information about this in the introductory chapters.
Greyscale images are mainly produced by scanners.
When you convert a colour image to a greyscale image you lose the information about the colour values, but for lower resolution output devices you will save memory and speed up screen drawing. You should do this conversion only when you are sure that you will never want to print the image to a higher resolution output device.
A monochrome image that is converted into a greyscale image can also be reproduced on output devices with different resolutions and can be enlarged/reduced. During this you will lose resolution, however, as Calamus attempts to create grey values from the pixel distribution in the image.
To convert a colour or monochrome image to a greyscale image,
select the image frame and the click on the Greyscale image
icon.
