Hi, Just for info :
TIFF can be declined in even more formats : Going further on with different TIFF files http://www.imagemontage.com/Docs/TIFFInternal.html Extract : "TIFF file have many formats: Black and white, gray scale, full color (24-bit), and palette color (4-bit and 8-bit) images. TIFF files support the uses of data compression using: LZW, PackBits, and CCITT 1D compression (PackBits and CCITT 1D are allowed on black-and-white images only), LZW can be used with any image type. " And some of the compressed TIFF formats enable you to have transparent B&W images in Autocad (very useful)... Regards, Robin. -----Message d'origine----- De : Uffe Kousgaard [mailto:[EMAIL PROTECTED] Envoyé : jeudi 1 septembre 2005 18:20 À : Mapinfo-L Objet : Re: MI-L Réf. : MI-L save window & print resolution Hi Christiane, Please let me add a few comments on your raster formats. There are 3 kinds of bitmap formats: Uncompressed: TIF, BMP, PSD Compressed, loss-less: PNG, TIF, GIF Compressed, with loss: JPG Main comment is PNG is not a compromise between size and quality, since quality is as good as in the uncompressed formats. Secondly: TIF exists both in compressed and uncompressed versions (both loss-less). That is called "TIFF LZW" in MapInfo. But I agree, when you say PNG is the way to go :-) Regards Uffe ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: <mapinfo-l@lists.directionsmag.com> Sent: Thursday, September 01, 2005 5:29 PM Subject: MI-L Réf. : MI-L save window & print resolution Hi, I encountered the same kind of problems one year ago while we prepared our atlas for print. When you chose to export your windows, there are several types of format which you can chose. a) Raster format export your maps as if they were photographs. That could create huge files depending on your resolution and map dimension. Nowaday printers takes up to 1200dpi if they are good printers. But 600 dpi shold be good enough.. With raster format, things could go wrong in different ways; one important thing lies with PageMaker too : are you sure that you have chosen the right options in dealing with the picture ? Sometimes it can compress pictures which isn't a good idea. There are two kinds of raster formats : the uncompressed ones : *.tif, *.bmp, *.psd; the first is the most frequently used; the second is a Microsoft format and the last is a Photoshop format. Of the three, the tif format is probably the most frequently used. Among the compressed files format, you have the *.jpg and the *.png. The frequently encountered jpg format, is a compressed format which creates bad artifacts with limits and could blurr your maps; it's made for photographic images, not for charts or maps which should keep clean borders. The *png format is also compressed but of better quality. It's the way to go if you want a good compromise between size and quality. If space isn't a criteria, then the Tif format is better. As far as compressed format goes, it would be better to have *.Gif format rather than *.jpg. The former is able to keep clean borders, while the other isn't. --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 17714 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 17715
