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Question #1:
Can anyone describe the specific issues that will be created by the TV’s processor downscaling?
From the articles the images can have:
The images will appear “Muddy” (scientific term) as a result of a loss of sharpness.
Will the images suffer a loss of details?
Will shadows and highlights degrade?
What other items would you add?
Question #2: Depends on the Image:
I know many of you will say: "It depends on each image”. “If resizing is artifact-free, you may not need to change a thing; photographic workflows can become complicated enough as is. Many photos do not have detail which is susceptible to moiré: regardless of the interpolation.”. However, if you were processing 250,000 images, how would you approach the issue of which algorithm to use?
Question #3: Other articles recommended using Photoshop’s “Preserve Details 2.0”
Does anyone have experience using one versus the other?
The goal is to minimize aliasing artifacts: moiré from downscaling or reducing the images.
Question #4:
The following are the key points from the two articles:
Thank you for your time.
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If you're after a definite answer, test with multiple sample images on the device and viewing distance/conditions in final use.
If you're happy with "general" suggestions, then I personally would use Bicubic Smoother, then an appropriate post downsampling sharpening of your choice (there are so many methods and even more subjective opintions).
If you suspect that there is image content that will alias and show moiré or other weird results such as fine repeating patterns, then a 1-2px pre-blur before the resize can help avoid or limit issues in such areas. Sometimes you will need to recreate such elements in the resized version if they are critical and have suffered greatly from the resize. Also, one can experiment with different resizing techniques which may have better results than others for such elements.
Also adding some minor selective noise (generally not in the shadows, sometimes in the highlights) to areas that have "lost life" in the resampling can bring back the appearance of minor detail.
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Stephen:
Thank you for your quick response. This is exactly the kind of “real-world experience” I am looking for. I am eager to hear from others in the community so I can further refine the workflow. At the end of the day, I will arrange with a local retailer (such as Best Buy) to permit me to load a series of pictures into 4 of their displays side by side to make the final assessment. However, I need to have processed a good number of images with the key options to make that time investment worthwhile.
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You are unlikely to see any difference from downsizing. Saving as JPEG vs a non-lossy format might make a small difference.
The biggest advantage to downsizing before you send them to the TV is file size, you can fit more small files on your media, they will transfer across a network faster, and they will load faster on the TV. Just batch process and downsize as your last step before display.