hi all, do you think there are artifacts? is artifact happened in any shot? i shot this iso200, processed with raw files..

I am not sure is that artifacts, but i don't know what to do if a iso200 and raw file process only with default raw converter sharpening will create artifacts.

i am clueless if these are artifacts..what do you think? by the way, this image is only rejected by one agency and i asked for detailed since i don't really 'see' it.


By mtkang at 2010-10-09


By mtkang at 2010-10-09

Severe purple/bleu fringing on belt.

Patrick.

I'd have corrected the fringing in RAW as well although this isn't your question...

Be careful with sharpening, it can make existing noise worse. Just import the RAW file without sharpening and then if you really have to, sharpen the important areas instead of the entire image.

You could also easily get rid of these "artifacts" (or noise) with some noise reduction software.

Personally, I wouldn't have submitted an image with that amount of noise/artifacts. Hard to tell without seeing the entire image. No idea where the focal point is.

hi click_click, so u think there is a certain amount of noise/artifacts? I thought since i shoot at iso200 and raw to jpg, with outdoor light..even there is noise or artifacts in shadow area, it will be acceptable.

The sharpening i think is by default of raw converter, quantity is 25, but i hardly think a 25 sharpening may introduce artifacts.

actually this results are the best my camera can produce, i google internet of artifacts..i see maze like, i check out some samples of artifacts, i didn't really see mine is as worse as.

maybe i should try to train my eyes more! but one thing i notice that it is always the bokeh will make artifacts obvious.

Quote from: click_click on October 09, 2010, 14:42
I'd have corrected the fringing in RAW as well although this isn't your question...

Be careful with sharpening, it can make existing noise worse. Just import the RAW file without sharpening and then if you really have to, sharpen the important areas instead of the entire image.

You could also easily get rid of these "artifacts" (or noise) with some noise reduction software.

Personally, I wouldn't have submitted an image with that amount of noise/artifacts. Hard to tell without seeing the entire image. No idea where the focal point is.

Quote from: mtkang on October 09, 2010, 14:55
hi click_click, so u think there is a certain amount of noise/artifacts? I thought since i shoot at iso200 and raw to jpg, with outdoor light..even there is noise or artifacts in shadow area, it will be acceptable.

The sharpening i think is by default of raw converter, quantity is 25, but i hardly think a 25 sharpening may introduce artifacts.

actually this results are the best my camera can produce, i google internet of artifacts..i see maze like, i check out some samples of artifacts, i didn't really see mine is as worse as.

maybe i should try to train my eyes more! but one thing i notice that it is always the bokeh will make artifacts obvious.

A low ISO doesn't automatically mean you cannot "create" plenty of noise. In general we could claim that ISO 200 wouldn't cause enough noise in an image to be rejected.

At iStock the super artsy images have noise added to the shot to give it a certain look and they're also accepted.

Your shot may be on the verge of what an inspector/reviewer is allowed to pass. Some might pass it, some might reject it.

The bokeh (or out of focus areas), especially when they consist of brighter colors you would immediately see artifacts or noise. Those areas are supposed to be nice and smooth and not gritty looking with grains and dots of course.

Those blurred areas are a perfect area to use a blur filter or noise reduction to make them look nice and smooth. No fear of losing detail.

ok thanks! will just take note next time.

Quote from: patrick1958 on October 09, 2010, 13:51Severe purple/bleu fringing on belt.

Yap there is an elephant in the room.  Oh well...

hi what do you mean? can't really get it..

I thought the purple/blue fringing on belt is not that worse, anyway guess different people got different eyes.

Quote from: FD-regular on October 09, 2010, 18:42

Quote from: patrick1958 on October 09, 2010, 13:51Severe purple/bleu fringing on belt.

Yap there is an elephant in the room.  Oh well...

Sorry mtkang I see nothing in the whole photo that is sharp and free of fringing and artifacts. Maybe it's just that it's 200% of a small section or something? But the whole image is soft, it's not just bokeh in the background.

The black isn't black and the silver line across the end of the belt has a blue line running along it. Unless of course the end is blue and the belt is purple and grey? In which case it just looks like bad colors, soft focus and fringing. 

What grabs my attention is the lack of focus, or extremely shallow DOF. Looks like only millimeter of that belt is really sharp. Then the next is the blue fringing.

Also if this is the final, complete image, I am not sure who you are targeting with this image. Who do you think will buy it and for which design can it be useful?

Or is this just a small section of the complete image?

all the crop parts are not focus part, that's why nothing is sharp.

cobalt, you mean you can't tell this is just a small section of the complete image?

Quote from: cobalt on October 10, 2010, 20:25
What grabs my attention is the lack of focus, or extremely shallow DOF. Looks like only millimeter of that belt is really sharp. Then the next is the blue fringing.

Also if this is the final, complete image, I am not sure who you are targeting with this image. Who do you think will buy it and for which design can it be useful?

Or is this just a small section of the complete image?

anyway, just to share some of my findings, if you use raw converter in photoshop, there is always a default 25 of sharpening and 25 of color noise reduction, it is under 'details'. In this image, it is the 25 sharpening that cause the so called artifacts, it becomes much more obvious on bokeh area.

I saw that one image was a crop, but I have no idea if the close up of the belt was the final image or not. I have seen people submit images like this, so apologies for the misunderstanding.

Glad you solved your problem with the artifacts.

Quote from: mtkang on October 11, 2010, 06:41
cobalt, you mean you can't tell this is just a small section of the complete image?

Quote from: cobalt on October 10, 2010, 20:25
What grabs my attention is the lack of focus, or extremely shallow DOF. Looks like only millimeter of that belt is really sharp. Then the next is the blue fringing.

Also if this is the final, complete image, I am not sure who you are targeting with this image. Who do you think will buy it and for which design can it be useful?

Or is this just a small section of the complete image?