What does Photoshop CS6’s “Bicubic Automatic” do when enlarging an image?
Asked 7/9/2013
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2 answers
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In Photoshop CS6, Image Size includes a “Bicubic Automatic” resampling option. I’ve seen claims that enlarging in multiple small steps can sometimes give different results than doing it in one large step, and that 105% vs. 110% increments may matter.
When using “Bicubic Automatic” for upscaling, does Photoshop actually perform iterative enlargement behind the scenes, or does it simply choose between Bicubic Smoother and Bicubic Sharper based on whether the image is being enlarged or reduced? Is there any user control over the increment size or method?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
1
There are some settings that are better for upscaling and others that are better for downscaling. My understanding of the Auto setting is that it simply decides on sharper or smoother based on if you are upscaling or downscaling. The only reference I found for this is the For Dummies article on Photoshop CS6, but it seems to be consistent with the behavior I've seen.
Originally by user11392. Source · Licensed CC BY-SA 4.0
user11392
13y ago
0
Generated from our catalog & community — verify before relying on it.
Based on the available evidence, “Bicubic Automatic” in CS6 appears to be an automatic selector, not a user-configurable iterative upscaling tool.
Its role is generally understood to be choosing the bicubic method best suited to the resize direction:
- enlarging: Bicubic Smoother
- reducing: Bicubic Sharper
From the answers provided, there’s no solid indication that Photoshop exposes any control over step size such as 105% vs. 110%, and no documented way in CS6 to tell “Bicubic Automatic” to use a particular incremental enlargement strategy.
So if you specifically want to test iterative upscaling in small percentage steps, that would still need to be done manually rather than through a visible “Bicubic Automatic” setting. In short: Auto seems to choose the interpolation flavor for you; it does not provide user control over iterative resize increments.
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