Standard vs HDR processing of X-Ray - a photo on Flickriver

            An experimental X-Ray image of an alarm clock. On the left is my standard-type processing, which amounts to little more than setting the black and white points on a single exposure. On the right is an HDR-processed image, made from five images at exposure intervals of about one stop. The slight colour cast to the HDR image should be ignored.

The HDR image is interesting to me, because it shows much more in the mid-range than the standard image. The (plastic) cogs are rather more visible, and you can also see more detail in the circuit board, motors, and the clock surround.

On the down side, the HDR image is much noisier than the non-HDR version. I've used a lot of noise reduction on this image, re-sizing, and other tricks, but the original was nasty.

The immediate conclusion is that it's probably worth pursuing some more HDR tests. It will be slow, though - in order to reduce original image noise I will have to make multiple images at each exposure level and stack them, then combine the images in an HDR processor. A quick bt of arithmetic shows that for a seven-level HDR and good noise reduction I'll need something like 7 x 12 = 84 exposures. I may be able to reduce this a bit but even so, at a minute per exposure (to avoid overheating the X-Ray tube) we're probably looking at an hour per image before processing.

Oh, and Tesco - I was really disappointed to discover that this £4 'mechanical' alarm clock you sold me doesn't actually ring its bells. The X-Ray shows that the bell 'clapper' is bolted solidly to the frame. I expected better for £3.99! 

Comments are warmly welcomed.

Taken on: March 3, 2016

Tags:

X-Ray

alarm

HDR

experiment

noise

stacking

radiograph

radiography

radiographic

radiology

seethrough « less

Sets appears in: • X-Ray

Groups appears in: • x-ray!

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