Here are the requested screen shots…
First are 2 screen shots provide examples of the modifications that Gigapixel is making to the resized image in each case. There are 3 separate images in each screen shot …
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Image 1: Original. This is a 1/36th crop of a 36 megapixel 16-bit ProPhotoRGB TIFF file converted from NEF raw with no adjustments made to the raw file. This is a recreation of a scenario where I successfully produced a 13x19 fine art print @300 ppi from such a crop using other up-rezing software.
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Image 2: Original up-rezed @ 200%, as 16-bit ProPhotoRGB using Photoshop Image Size. (Other up-rezing softwares yield identical results.) In Lightroom, there is no difference in the histograp between this image and the original, and there is no noticeable difference when flipping between the images.
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Image 3: Original up-rezed @ 200% as 16-bit ProPhotoRGB using Gigapixel. In flipping between either this image and the original, or any of the other up-rezed images I created in this test, there is a noticeable difference in brightness and contrast in both the images and their histograms.
Note that in both cases, the images are colour (not B&W) and no further processing (sharpening or adjustments) were made to the output images. The red borders were added during the crop of the original to ensure a correctly sized crop.
The next two screen shots included are typical of the Input and Output screens of Gigapixel. I don’t have time to repeat the runs, but I used the same inputs every time, and got pretty much the same results screens.
Note: while this image shows the Enhance checkbox selected, the Gigapixel-enlarged images above were made without that checked. However, the both the visible results and the histograms were exactly the same whether or not Enhance was checked.
I think these samples are fairly self-evident, but let me know if there is anything further you need.
