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1. Re: What do I need to process raw files in Photoshop CS5 for a Canon Rebel EOS t4i?
you need to convert the files to DNG and then you'll be able to process with CS5.
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2. Re: What do I need to process raw files in Photoshop CS5 for a Canon Rebel EOS t4i?
You would need ACR 7.x which is available in CS6. Or as ertho said you can get the free DNG 7.3 converter and convert raw to a DNG.