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Does ACR process the entire RAW file?

I have an expert telling me that ACR does not use all of the data within a CR2 file when rendering it into Photoshop.  I opened a CR2 file with both ACR and Canon's software (DPP4) and immediately saved into TIFF.  The PS file was 35 meg and the DPP4 file was 185 meg.  Another friend suggested that this difference was caused by the PS file being in 8 bit and the DPP4 file was 16 bit. Can anyone confirm/refute that ACR uses all of the data within the CR2 file when rendering?  Is there any historical validity in the statement? 

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Does ACR process the entire RAW file?

I have an expert telling me that ACR does not use all of the data within a CR2 file when rendering it into Photoshop.  I opened a CR2 file with both ACR and Canon's software (DPP4) and immediately saved into TIFF.  The PS file was 35 meg and the DPP4 file was 185 meg.  Another friend suggested that this difference was caused by the PS file being in 8 bit and the DPP4 file was 16 bit. Can anyone confirm/refute that ACR uses all of the data within the CR2 file when rendering?  Is there any historical validity in the statement? 

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Re: Does ACR process the entire RAW file?

Adobe Community Professional , Nov 12, 2019

Moved to the Camera Raw forum from the Photoshop forum.

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The bit depth of the image is determined by a setting in...

Adobe Community Professional , Nov 12, 2019

The bit depth of the image is determined by a setting in your camera. For instance, on my camera I can choose to have my raw images saved as 12 bit or 14 bit images. Camera Raw cannot change that. Camera Raw opens the image and allows you to edit the data that was taken and then converts that image to an RGB image when it sends it to Photoshop. When you finish your editing in Photoshop you have a choice of different formats that you can save your resulting work to. If you choose to save the image as a TIF file then you can choose to save an 8 bit or 16 bit image. One thing you cannot do is save the original raw file from Photoshop. Photoshop cannot do anything to the original raw image. That is why Camera Raw is needed. Don't know if this answers your question, but I don't believe the explanation you got from your expert is correct.

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Re: Does ACR process the entire RAW file?

Adobe Community Professional , Nov 12, 2019

To clarify what Jim said, you can set Camera Raw to open the image as 8 or 16 bit. You need to do that before you open it in Photoshop. 

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Re: Does ACR process the entire RAW file?

Adobe Community Professional , Nov 12, 2019

35 mb sounds very small for a tiff. 

What camera does the file come from?

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Re: Does ACR process the entire RAW file?

Canon 5D Mark IV....

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Re: Does ACR process the entire RAW file?

Adobe Community Professional , Nov 12, 2019

Also, make sure you don't have scaling turned on in the ACR preferences.

ACR scaling.jpg

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Re: Does ACR process the entire RAW file?

I cannot find this window in either ACR nor PS...Can you tell me how to get to it...Thanks Sam

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Re: Does ACR process the entire RAW file?

Adobe Community Professional , Nov 13, 2019

There is some text at the very bottom of the ACR window, with the file info, click on that.

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Re: Does ACR process the entire RAW file?

Got it...Thanks you...Sam

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