It is impossible to edit a RAW file in Photoshop?

I needed to edit an image using the tool clone in Photoshop and opens the file RAW from Lightroom to Photoshop to make the change. When I saved the image it registered as 'filename - Edit.tif' next to the RAW file. I added this image to my catalog so I could keep track of it.

I wanted to really do was make the change to the RAW file and record by overwriting the old file RAW.

I think that maybe it's not possible.

Could you be there someone here tell me why the RAW file could not be modified in Photoshop. Is to ensure that the RAW file will remain original, with only changes that appear in the file of .xmp sidecar? It's beautiful and good, but just dream to ensure that it is the only way that this is possible and that the changes in Photoshop will give a new separate file to save.

Thank you

Ken

I wanted to really do was make the change to the RAW file and record by overwriting the old file RAW.

It is indeed as you found impossible.

Could you be there someone here tell me why the RAW file could not be modified in Photoshop.

The reason is that the RAW file is a file mosaicked with data from sensor directly to each pixel. Two of the four pixels usually have a Green filter, while 1 out of four have a red and another 1 to 4 a green pixel. The data is usually stored with 12 or 14 bits of precision for each pixel. All this is inherently incompatible with the model of pixel in a program like Photoshop. To change these files in Photoshop, you have to Demosaic three-channel RGB data complete, making them in some color space, gamma correct them, sharpness, etc. That's what ACR and Lightroom for you. If you cannot change the underlying data using Photoshop. If edit you in Photoshop, you will always create a new file.

PS you may have noticed that edit in Photoshop creates a much larger than the original RAW format tif file. It is because of the patchwork of Bayer. You have a 12 megapixel. When shooting RAW 12 bit, this will result in a 18 MB uncompressed dataset (12MP * 12-bit /(8bits/byte) = 18 MB). Saved compressed losslesly and including a jpeg preview that gets you about 12 MB of a typical RAW file of this camera. When you return this to a 16-bit tiff file, you suddenly a full 3 x 16 = 48 bits per pixel! If this translates into a 72 MB uncompressed tiff file which probably compress to about 50% of that. More than 3 times larger than the original RAW format!

Tags: Photoshop Lightroom

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