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Photoshop, file formats and handling in the memory

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Old 24-09-2010
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Photoshop, file formats and handling in the memory
  

Considering the differences in various file formats and the various restrictions the formats have, I was wondering about some details regarding PhotoShop.

If you are based in the photo world and load a photo as jpeg, tiff, nef (raw); will they be treated differently (visual end result) in the framework of the PhotoShop side ? If you go based on the bit- depth is equal to the file(s).

Expect that there will be some differences out walking technically how the PhotoShop is working with the files such as those layers, but thinking more on the loss of quality, etc. before storing.

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Old 24-09-2010
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Re: Photoshop, file formats and handling in the memory

.jpg has minimal image information in the so adjustments in the aftermath that will be much more destructive than an uncompressed format .tiff and nef/cr2/raw; but it is so clearly also pointless to save a .jpg file as .tiff, it will not help by any how when a picture is "broken" when it is first saved as .jpg.

I do not consider .jpg as a working format, it is the final format for web viewing and if anything should be adjusted/changed I go back to the uncompressed original format.

But to the point, things will probably be treated equally, but the result depends on what you originally put in. Loss of quality occurs when you save as .jpg .
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Old 24-09-2010
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Re: Photoshop, file formats and handling in the memory

If you think about RAM usage in Photoshop, only the number of pixels and pixel depth that determines this. Same picture in TIF, PNG or JPG will take as much space as Photoshop work for all compressed format decompressed for viewing. About the technology, quality is good or bad makes no difference to the consumption of RAM, but depends on how much editing the image can take.
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Old 24-09-2010
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Re: Photoshop, file formats and handling in the memory

The interesting thing is how Photoshop handles incoming data. So if you have an identical picture in jpeg and tiff, download these and run the span filters of these. Photoshop will then treat them differently because they are different formats, or use an internal "master solution" while it works. Assume that the "original file" is identical with regards to bit depth, etc. That one loses again by saving to jpeg is a completely different matter. Its so far agreed that jpg is not optimal for many purposes, but it is a different case (working even consistently in the raw).
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Old 25-09-2010
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Re: Photoshop, file formats and handling in the memory

Now it's probably just a few initiated at Adobe who knows how Photoshop work, but as said, any image format for extracting, as a JPG image is not jpg within the Photoshop, but a bitmap. If you look at Lightroom as it always works in 16 bit internally and with a large (ProPhoto) color. Photoshop doing enough anything similar, but if they for example converts to a standard color space and 16 bit I do not know, but they work guaranteed for a decompressed bitmap regardless of file type, so the pictures are identical in the results, but saving in JPG will you get the quality of the storage.
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