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== Eksponeringsblanding med digiKam ==

Denne artikel blev oprindeligt bragt i [http://scribblesandsnaps.wordpress.com/2010/05/25/exposure-blending-with-digikam/ Scribbles and Snaps] og bringes ger med Dimitri Popovs tilladelse.

Uanset hvor godt dit kamera er, så er det virkeligt vanskeligt at tage et veleksponeret billede af en scene med stor kontrast som en solsort i sneen. Selv hvis du skifter til manuel tilstand og tilpasser eksponeringsindstillingerne, så er der stadig en risiko for, at du ender med en foto med under- eller overeksponerede områder. Den eneste måde at løse dette problem på er at bruge eksponeringsblanding. Denne teknik bruger flere fotos af den samme scene med forskellige eksponeringer og forener dem til et perfekt eksponeret billede.

While exposure blending sounds simple in theory, achieving usable results can be a rather laborious and time-consuming process. Fortunately, '''digiKam''' can do the donkey job for you thanks to an <menuchoice>exposure blending tool</menuchoice> bundled with the '''Kipi''' plugins. The exposure blending tool relies on the '''hugin''' application for processing and fusing photos, so you must install it on your machine beforehand. On '''Ubuntu''', this can be done using the command {{Input|1=sudo apt-get install hugin}}

To keep things tidy, move the photos you want to blend into a separate album, select them using the <keycap>Ctrl+A</keycap> keyboard shortcut, and choose <menuchoice>Tools</menuchoice> -> <menuchoice>Blend bracketed images</menuchoice>. This opens the '''Exposure Blending Import wizard''' that guides you through the entire process. In the <menuchoice>Set Bracketed Images</menuchoice> window, add other photos if needed, and remove and rearrange the photos that are already in the list. Hit then the <menuchoice>Next</menuchoice> button to move to the next step. '''digiKam''' can align the selected photos before blending them. This feature can come in handy if you took the photos without a tripod. If this is the case, tick the <menuchoice>Align bracketed images</menuchoice> check box, and press <menuchoice>Next</menuchoice> to start the pre-processing. Once '''digiKam''' is done, press <menuchoice>Finish</menuchoice>, and you will be automatically dropped into the '''Exposure Blending''' editor.

[[Image:Digikam_exposureblending.png|thumb|300px|center]]

Hit the <menuchoice>Preview</menuchoice> button to see the blended photo in the preview pane. If you are not satisfied with the result, you can tweak the available options, including exposure, saturation, and contrast. You can also exclude individual photos from the stack to improve the blending result. The clever part is that every time you tweak the settings and press the <menuchoice>Preview</menuchoice> button, '''digiKam''' generates a preview image which you can compare with the previous versions. You can then save all the generated versions, or save only the one you like most.

Although '''digiKam'''’s exposure blending tool is not the most powerful or flexible solution out there, it is capable of producing rather impressive results, especially if you are not afraid of getting your hands dirty with manually tweaking the final results.

[[Category:Graphics]]
[[Category:Photography]]
[[Category:Tutorials]]