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Old Jan 19, 2004, 12:12 AM   #1
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Default Sony F717 sharpness Test.

Here are a few pics....Trying to get the most sharpness out of the camera....wasn't too worried about pics being straight and all. What do you think? Did only slight USM in photoshop.








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Old Jan 19, 2004, 2:54 AM   #2
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What sharpness setting were you using on the camera? I always use the default. I don't see the need to sharpen in-camera, because that will probabably just sharpen whatever noise is present in the image. I do all the sharpening afterward. I seem to get good results when resizing pictures if I do it in 2 parts instead of all at once. Say I want to resize a full 2560x1920 picture down to 800x600 (with resampling, of course). I get the "messy" reszing out of the way in the first step by resizing to 1600x1200. Then I sharpen, and resize again to 800x600. This seems to produce a better result than going straight to 800x600 and sharpening the final product. The difference is especially apparent when the original picture contains something that's subject to moire distortion when resized.
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Old Jan 19, 2004, 3:17 AM   #3
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Sorry if it seems like I'm trying to steal your fire... your pictures look good.

But, I have two images that prove the adventages of my two-step resizing method.

Here's the view from my hotel room in Chicago last June.

In the first version, many of the buildings got a moire effect when the picture was resized from 1536x2048 (yep, it was taken in 3 MP mode) to 480x640. I applied USM with radius .2 at 100% to this picture. They look better in the second version. I resized to 960x1280, applied USM with radius .3 at 100%, and then resized to 480x640. The grids in the building facades look cleaner. It may not be quite as apparent viewing the images on this forum as it is when I toggle between them in IrfanView.




If this already a well-known trick, then I feel somewhat silly, but also proud for having discovered it on my own...
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Old Jan 19, 2004, 6:47 AM   #4
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Quote:
Originally Posted by UrbanPhotos
If this already a well-known trick, then I feel somewhat silly, but also proud for having discovered it on my own...
I didn't know it ! Thanx for sharing !
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Old Jan 19, 2004, 7:44 PM   #5
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Well....I like your technigue. I think I need to give it a try. I have always read that you do not want to sharpen and then downsize the pic...but by your examples....the second picture does look better than the first.

I used in camera sharpening of +1. I can not go up from this because I do notice some noise in the image. These pictures were taken with iso200 at f4 at about 1/200. I tried several other pics at different aperature settings, but f4 did seem to provide the sharpest pictures. I have read on other forums that F4 is the "sweet spot" for the f717. I then decided that if F4 is the sweet spot...then what focal length would add to the sharpness. I think all pictures were very sharp at all 3 focal lengths. I think my USM settings were 100/.6/2. I really have no system for sharpening but I have seen some really sharp pictures out of the F717 by other photographers but I am sure that this is achieved through post processing which I lack the ability to perform with greatness.

"some time later":

I went ahead and took a picture and applied your technigue and this is the end result.




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