change picture size

picture

width (default = proportional to height)

height (default = proportional to width)

refine edges

dithering (photograph)

 

The change picture size function makes it possible to convert the picture dimensions. The picture to be converted is entered as a picture parameter, the converted picture is transferred to the function output.

 

The width and height parameters are numeric parameters specifying the picture's new size. If the numeric value is not entered, then the corresponding dimension will be converted proportionally to the other dimension entered. By entering a negative value the picture will be flipped in the corresponding direction.

 

The refine edges parameter is a logic switch. It provides for conversion with interpolation of pixels. It is used for high quality conversion; the resulting picture will retain its appearance even after the conversion. This method, though rather slow, is an accurate one. The default setting of this switch is "off".

 

The dithering parameter takes care for a proper semi-shades display by means of dithering. The switch is disabled, if the "refine edge" switch is not on. The default setting of this switch is "on". It is used above all in converting photographs; it is advisable to switch the dithering off when converting drawings.