![]() Minimize this file (one might use it again later to adapt the selection chosen). Once the selection corresponds to the overexposed areas, save this selection to the file xyz_b_2.tif. In this case the result will look like the image below. The image should be enlarged to at least 100% in order to fine tune the selection (add to and subtract from). Tolerance: 15 / Anti-alias: on / Contiguous: off / Sample all Layers: off Use the Magic Wand Tool with the following settings: Use the Magic Wand Tool to select the region that is over exposed. In xyz_b_2.tif (refer to the picture to the right above) find the region with the most amount of black. The image to the left serves as an aid when deciding about the selection. Arrange both files next each other on the screen. In xyz_012.psd select the layer you are currently working with. The sections with the most amount of light appear in black. Image / Mode / Greyscale / discard Color information Select the medium exposed file (xyz_b_1.tif). Rename each layer in the new file as reference to the original files (created by PTGUI). Move and match each layer into a new file and save it in PSD format (xyz_b012.psd) Open Photoshop and open all three output files created by PTGUI. The output chosen here results in three (3) separately blended files of the panorama.Įach file corresponds to one of the exposure settings upon shooting the panorama. The example described below uses the TIFF format as output. When saving in TIFF format the EXIF data is written to the output files but layer alignment is needed. But PTGUI does yet not write the EXIF data (Capture Data, aperture, Shutter Speed and Focal length) into the output file. When saving in PSD format the output consists of three layers, hence no layer alignment needed. Screenshot of PTGUI Pro 'create Panorama' Prepare and stitch the panorama in PTGUI with the output settings shown below in the screen shot of PTGUI. (a similar and much simpler workflow is described in the document Applying the simple High Dynamic Range (HDR) Technique). The goal was to obtain the maximum high dynamic range for the backlit windows only. The principle of this technique is visualized below and explained in full detail further on using an example of a scene shot with multiple images and stiched into a Panorama with the aid of PTGUI (The scene I used in this example is a Glass-Window painted by Augusto Giacometti in the Church of Grossmuenster in Zurich, Switzerland. Later at the computer - our digital lightroom - one loads the three images in Photoshop and creates the masks to be used to obtain a maximun high dynamic range of properly illuminated sections throughout the scene. - An 'average' exposed image to get details of the medium illuminated areas of the scene.- An under exposed image to get details of the highly illuminated areas of the scene.- An over exposed image to get details of lesser illuminated areas of the scene.Normally one takes a minimum of three bracketed shots of a scene. Only change the exposure time in order to obtain optimum results. When shooting bracketed images never change the f-Stop as it would influence the depth of field and the hyperfocal distance. This technique can be used to obtain a high dynamic Range of a scene shot with bracketed images. Each mask allows full visibilty contol over select portions of a layer - just like in a 'collage'. Photoshop provides a technique to work with masks. (update: March, 2009 - The title of this procedure may be misleading, this procedure is actually referring to LDR and not to HDR. (by Hans Loepfe, HALO Photographs, Zurich, Switzerland)Īdvanced High Dynamic Range (HDR) Workflow applied in Photoshop This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Switzerland License.
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