Am Donnerstag, 4. Dezember 2014, 12:13:13 schrieb Francisco Cribari: > I usually post my photos in a some photography-related Facebook discussion > groups. One my favorite groups is Black and White Universe: > https://www.facebook.com/groups/177407189132194 . Their rules include the > following: "Entry photos must be in a standard size of 8'x12' with a > minimum size of 2000 pixels on the short side and 3000 pixels on the longer > side." Recently, my photos have been excluded from the group, even the ones > that have 3000 pixels on the largest size. I sent the following message to > the group administrator: "Dear Teo: Do you think you can help me understand > the rule? The rule is: "- Entry photos must be in a standard size of 8'x12' > with a minimum size of 2000 pixels on the short side and 3000 pixels on the > longer side. It must have NO BORDERS." The photo I posted yesterday had > 3000 pixels on the largest side and 2000 pixels on the shortest side. Why > was it removed? Was it because of DPI? Do I need to set a DPI value? The > software I use (Darktable - see http://www.darktable.org) does not allow me > to do that. I don't quite understand what is meant by "standard size of > 8'x12" for a digital image. It seems that the important bit is resolution
Exactly, the resolution (in pixel²) is the important part, the inch size (which is equivalent to a set PPI value) is meaningless. However, you can tell darktable to set a specific PPI value for exported images. By default it is using 300 PPI which would result in less than 8x12. To get the required conversion 2k pixel == 8" and 3k pixel == 12" you want 250 PPI. If you are running either one of the recent release candidates or a git compile you can set it in ~/.config/darktable/darktablerc, the key is metadata/resolution. [...] > Best, Francisco Tobias PS: I assumed that you meant inches and not feet.
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