Hi On Fri, Apr 20, 2012 at 2:17 PM, Marco Hugentobler <marco.hugentob...@sourcepole.ch> wrote: > Hi > > >>BTW Freak out will go after resampler branch is merged.... > > I've managed to convert freakout style to singleband pseudocolor in the > project file / qml conversion to the new format :-) > >> - visualizing monoband rasters could be improved: >> >> - why not loading it with a greyscale by default? or with a colour ramp? >> - why not adding a dtm colour table (we can take the one > > > I'd like to improve selecting colorramps in the raster resampler branch > (that would even allow us to add a freakout color ramp for trips down memory > lane). > > Default style: I'm not sure what would be a good default, since we don't > know the value range at the beginning (at least not without doing a time > consuming value scan). Do you have any ideas (maybe a partial raster scan to > speed things up?). >
Yes - Julien had a really nice suggestion to implement the following logic: - on initial load of a raster, generate a quicklook that is the larger of 1/4 screen resolution or 500x500 pixels by sampling every nth pixel - generate a histogram from the quicklook - calculate clipped 2% - 96% range min max for each band - apply a histogram stretch based on the above - the histogram could be used for generating the graph in raster props, and the quicklook could be used to create thumbs and previews etc - ideally we should cache these quicklooks and only regenerate them if the underlying dataset has changed I believe if we do this we will have fast initial load and the images (grayscale and rgb) will 'look right' when first loaded (i.e with good contrast) and it would not be necessary to assign any color value to grayscales by default. Regards Tim > Regards, > Marco > > > On 20.04.2012 11:10, Tim Sutton wrote: >> >> Hi >> >> On Fri, Apr 20, 2012 at 10:47 AM, Giovanni Manghi >> <giovanni.man...@gmail.com> wrote: >>> >>> On Fri, 2012-04-20 at 10:19 +0200, Paolo Cavallini wrote: >>>> >>>> Hi all. >>>> Visualizing monoband rasters could be improved: >>>> - why not loading it with a greyscale by default? or with a colour ramp? >>>> - why not adding a dtm colour table (we can take the one >>>> in/usr/lib/grass64/etc/colors/terrain), possibly replacing the Freak out >>>> one? >>> >>> +100 >>> much needed improvements >>> >> All good ideas but we are feature frozen so lets first focus on >> releasing 1.8 and then we can do these. >> >> BTW Freak out will go after resampler branch is merged.... >> >> Regards >> >> Tim >> >>> -- Giovanni -- >>> >>> >>> >>> _______________________________________________ >>> Qgis-developer mailing list >>> Qgis-developer@lists.osgeo.org >>> http://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> >> > > > -- > Dr. Marco Hugentobler > Sourcepole - Linux& Open Source Solutions > Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland > marco.hugentob...@sourcepole.ch http://www.sourcepole.ch > Technical Advisor QGIS Project Steering Committee > > > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-developer -- Tim Sutton - QGIS Project Steering Committee Member (Release Manager) ============================================== Please do not email me off-list with technical support questions. Using the lists will gain more exposure for your issues and the knowledge surrounding your issue will be shared with all. Visit http://linfiniti.com to find out about: * QGIS programming and support services * Mapserver and PostGIS based hosting plans * FOSS Consulting Services Skype: timlinux Irc: timlinux on #qgis at freenode.net ============================================== _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer