The number of colors really in use should be little (beetween 10 and 30 colors depending on the product). I can replace "3 chars" by "1 or 2 chars" using an index for all images (too big again) And for each pixel, I have to know the color value... Nicolas
_____ De : svg-developers@yahoogroups.com [mailto:[EMAIL PROTECTED] De la part de Andre M. Winter - Carto.net Envoyé : mercredi 22 juin 2005 16:01 À : svg-developers@yahoogroups.com Objet : Re: [svg-developers] Re: Value of a pixel do you really need ALL color values?! andré -- ___________________________________________________________________ andre m. winter, cartography for internet and multimedia applications schiessstand 4/1, a6091 goetzens, tyrol, austria tel.: ++43.5234.32732 email: <[EMAIL PROTECTED]> <http://www.vectoreal.com/> SVG consulting and development <http://www.carto.net/> online cartography focusing on SVG <http://www.carto.at/> print and online touristic map solutions >Hi André, > >Effectively, 600² is not too much for JS. But to get this array from JS, I >have to use a XMLHTTP request to the server. The server response will be a >text stream send to JS. The size of the text stream will be : >- for 8bits images : 600 x 600 x (3 chars, to represent the lookup table >index as text) = 1080000 bytes. So 1 MB to transfert.... >- for 24bits images : 600 x 600 x 3 (for RGB values) x (3 chars for each >color value) = 3240000 bytes. So 3 MB to transfert... > >Perhaps can I use another kind of stream ?? > >Nicolas > > _____ > >De : svg-developers@yahoogroups.com [mailto:[EMAIL PROTECTED] >De la part de Andre M. Winter - Carto.net >Envoyé : mercredi 22 juin 2005 14:22 >À : svg-developers@yahoogroups.com >Objet : Re: [svg-developers] Re: Value of a pixel > > >hi nicolas, > >you should be able to place the color value (or whatever value) info per px >in a 2-dim js-array and access this on mousemove based on some returned >screen coords. 600² is a lot but not too much for js. > >andré > > > > ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . [Non-text portions of this message have been removed] ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
