OpenOffice.org OpenOffice - 3.3 Guía de usuario descargar pdf (Pagina 104)

1 bit dithered

The impression of grayscale is produced by a

raster. In reality there are only two colors.

1 bit threshold

The threshold determines which pixels are black

and which are white. You cannot set it directly

but you can influence which part of the image is

set to black by varying color settings on the

picture toolbar—red, green, blue level,

brightness, contrast, and/or gamma value—to see

what works best for your image. You must export

and save the modified image with File > Export

and then reopen it, before you finally change the

color depth.

4 bit color palette

With 4 bits a total of 16 colors can be produced.

The color steps are quite fine, because the

process does not use the 16 RGB basic colors, but

selects from the palette those that best match the

colors in the image.

4 bit grayscale palette

8 bit color palette

With 8 bits a total of 256 colors can be produced.

The image at left is at first glance very difficult to

distinguish from the original. A big difference is

that the picture file is only one third of the size of

the 24 bit version.

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 104