In message <7543587.5hs8tdGgKJ@liber> on Thu, 04 Dec 2014 18:12:07 +0100, Tobias Ellinghaus <[email protected]> said:
houz> Am Donnerstag, 4. Dezember 2014, 12:13:13 schrieb Francisco Cribari: houz> > I usually post my photos in a some photography-related Facebook discussion houz> > groups. One my favorite groups is Black and White Universe: houz> > https://www.facebook.com/groups/177407189132194 . Their rules include the houz> > following: "Entry photos must be in a standard size of 8'x12' with a houz> > minimum size of 2000 pixels on the short side and 3000 pixels on the longer houz> > side." Recently, my photos have been excluded from the group, even the ones houz> > that have 3000 pixels on the largest size. I sent the following message to houz> > the group administrator: "Dear Teo: Do you think you can help me understand houz> > the rule? The rule is: "- Entry photos must be in a standard size of 8'x12' houz> > with a minimum size of 2000 pixels on the short side and 3000 pixels on the houz> > longer side. It must have NO BORDERS." The photo I posted yesterday had houz> > 3000 pixels on the largest side and 2000 pixels on the shortest side. Why houz> > was it removed? Was it because of DPI? Do I need to set a DPI value? The houz> > software I use (Darktable - see http://www.darktable.org) does not allow me houz> > to do that. I don't quite understand what is meant by "standard size of houz> > 8'x12" for a digital image. It seems that the important bit is resolution houz> houz> Exactly, the resolution (in pixel²) is the important part, the inch size houz> (which is equivalent to a set PPI value) is meaningless. However, you can tell houz> darktable to set a specific PPI value for exported images. By default it is houz> using 300 PPI which would result in less than 8x12. To get the required houz> conversion 2k pixel == 8" and 3k pixel == 12" you want 250 PPI. If you are houz> running either one of the recent release candidates or a git compile you can houz> set it in ~/.config/darktable/darktablerc, the key is metadata/resolution. houz> houz> [...] houz> houz> > Best, Francisco houz> houz> Tobias houz> houz> PS: I assumed that you meant inches and not feet. Another solution is to use ImageMagick on the exported image, as follows: convert -units PixelsPerInch input.jpg -density 250 output.jpg (replace input.jpg with your exported image and output.jpg with some suitable name) -- Richard Levitte [email protected] http://richard.levitte.org/ "Life is a tremendous celebration - and I'm invited!" -- from a friend's blog, translated from Swedish ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
