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184 Pictures, Lines, and Shapes

• For an image that will end up on a web page, it's possible to get great

results scanning at 100dpi, using exactly the screen dimensions you

need. If you're going to edit the image, increase the dpi to be on the

safe side.

• For line art and halftone images, save as a black-and-white TIFF,

PCX, or GIF.

• For greyscale photographic images, scan using greyscales and save

as a greyscale TIFF file. If you have a colour scanner, save a colour

TIFF. You can resize these images and still maintain reasonable

quality, provided you don't make them significantly larger than the

original. In general, the number of greyscales or colours is a more

important issue than the actual resolution (dpi).

• If you want your image to use lossless compression, either scan as png

or as TIF and then convert it to png within your publication.

• To obtain images of smaller file sizes, scan as jpg at 200dpi at the

highest quality.

• Depending on your scanner software, your may be able to perform

initial adjustments right at the source (e.g., adjustment of levels).

Often you can de-screen images to eliminate possible moiré patterns

(interference between the regular dot patterns in printed images and

the scanner’s path). If your scanner software doesn’t provide de-

screening, try using the PhotoLab's Gaussian Blur filter to remove

moiré.

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Serif PagePlus X4 Guía de usuario Pagina 194