HDR imaging represents a set of techniques which allow a greater dynamic range of exposures than normal digital imaging techniques. The purpose of HDRI is to represent more accurately the wide range of intensity levels found in different, ranging from direct sunlight to the deep shadows.
The new Photoshop CS2 includes such a tool, Merge to HDR. By using this tool a new image is created by combining two or more pictures with different exposures of the same place. It takes the best exposed parts of each picture and combines them to create a new picture, more full of detail.
For example one may want to take two pictures of a room. The first picture is exposed for the details inside the room to be noticed, while the second image is exposed as such for the details outside the window to be visible. Use the merge to HDR tool to create a single image by combining the two.
These are the steps necessary to work with Merge to HDR:
Open the Merge to HDR dialog box by following these steps: Choose the file > Automate > click on the Merge to HDR option.
Then select the images to be merged. One should remember to check the Attempt to Automatically Align Source Images. Another option found in the Merge to HDR window is the Bit Depth option.
Because the result of HDR imaging is a picture containing a way larger dynamic range than normal photos, a greater number of bits per color channel is required.
There are three options from which one to chose when working with the picture, the 8 bit setting, the 16 bit setting and the 32 bit/channel, which is the HDR default in Photoshop. The 8 bit and the 16 bit settings are the most used ones. If working the 32 bit/channel setting, the resulting image can be saved in one of the following formats: TIFF, PSD (a Photoshop proprietary file format), or PSB (another sort of Photoshop file – Photoshop Large Document). One should take into consideration that is working if 32 bit/channel images, it may be possible for the image not to be used with many imaging software. But the image will also have a greater detail of color information than the pictures saved with either 16 bit or the 8 bit setting.
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