is HDR processing affected by faster memory card?

Started Apr 7, 2012 | Discussions thread
feijai
Regular MemberPosts: 210
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Re: is HDR processing affected by faster memory card?
In reply to dj0502, Apr 7, 2012

Almost certainly not. No digital camera manipulates images in flash -- that would be incredibly slow. Rather it writes to a RAM buffer which can hold up to some number of images, and manipulates them there before dumping to your card. For the 5N that number is around 7, since that's the number of images it can take at high-speed continuous shutter before it slows down -- it's just dumping to the buffer.

This buffer is, with near certainty, also used for doing HDR stitching, JPEG compression, and other color processing tricks. It's the processing that takes all the time. Then the final images are pushed to flash after completion, which takes a millisecond at most.

The reason your Sony requires at least moderately fast flash has nothing to do with the photo side. It's because it needs to dump out video frames to flash at 60 frames per second.

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