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Appearance of background screen effect on edited photos
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Aug 15, 2016 22:28:06   #
Baracuda Loc: Kentucky
 
I recently took photos with my Nikon D4s of a artist friend's acrylic paintings, using a ProFoto flash indoors on a tripod. I then opened each .jpg file with the Windows 10 Photo app (one of the picture tools) and did a quick edit of adjusting light brightness and a few contrast, then I cropped the image to have good clean sides.

When she opened them up on her computer, she noticed a very light screen effect, some with faint vertical lines (very subtle) alternating in lighter and darker streaks. It's almost a registration ghost image.
What did I do wrong? AND >>> How do I fix this? Do I need to edit in Elements or something else?

Another way of describing this effect is if you carefully laid down corduroy trousers down on the painting before it was completely dry and pulled them off. This is what you get. You have to look at the image closely and know that there is NO pattern like that on painting (not brush strokes)



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Aug 16, 2016 06:45:46   #
jerryc41 Loc: Catskill Mts of NY
 
Moire? I don't see the lines. Someone is going to suggest posting it again and click on "Store original." That will make it easier to enlarge the image.

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Aug 16, 2016 07:36:18   #
rmalarz Loc: Tempe, Arizona
 
Not being able to see the original, I'm only guessing. Depending on the thickness of the paint, it's possible your capturing the weave of the canvas on which the paint is placed.
--Bob


Baracuda wrote:
I recently took photos with my Nikon D4s of a artist friend's acrylic paintings, using a ProFoto flash indoors on a tripod. I then opened each .jpg file with the Windows 10 Photo app (one of the picture tools) and did a quick edit of adjusting light brightness and a few contrast, then I cropped the image to have good clean sides.

When she opened them up on her computer, she noticed a very light screen effect, some with faint vertical lines (very subtle) alternating in lighter and darker streaks. It's almost a registration ghost image.
What did I do wrong? AND >>> How do I fix this? Do I need to edit in Elements or something else?

Another way of describing this effect is if you carefully laid down corduroy trousers down on the painting before it was completely dry and pulled them off. This is what you get. You have to look at the image closely and know that there is NO pattern like that on painting (not brush strokes)
I recently took photos with my Nikon D4s of a arti... (show quote)

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Aug 16, 2016 11:02:31   #
pixbyjnjphotos Loc: Apache Junction,AZ
 
Baracuda wrote:
I recently took photos with my Nikon D4s of a artist friend's acrylic paintings, using a ProFoto flash indoors on a tripod. I then opened each .jpg file with the Windows 10 Photo app (one of the picture tools) and did a quick edit of adjusting light brightness and a few contrast, then I cropped the image to have good clean sides.

When she opened them up on her computer, she noticed a very light screen effect, some with faint vertical lines (very subtle) alternating in lighter and darker streaks. It's almost a registration ghost image.
What did I do wrong? AND >>> How do I fix this? Do I need to edit in Elements or something else?

Another way of describing this effect is if you carefully laid down corduroy trousers down on the painting before it was completely dry and pulled them off. This is what you get. You have to look at the image closely and know that there is NO pattern like that on painting (not brush strokes)
I recently took photos with my Nikon D4s of a arti... (show quote)


You say you used a flash. I agree with Bob. I have noticed, in my photo experience, that if I use a flash, it brings out the detail of the object more clearly than just natural light. You may have brought out a little more detail than you bargained for. That is why I use a flash when taking photos of flowers and antique tractors, even in fairly bright natural light. Natural light usually yields a slightly softer effect. There is something about the light temperature difference of a flash compared to natural light. I am guessing that if you used natural light rather than the flash you might not have the effect as a result or the effect would not be so noticeable. Just another guess without seeing the photo close up. Otherwise, your photo is wonderful. Keep up the great work, have fun, and have a GREAT DAY!

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Aug 16, 2016 11:34:55   #
bcrawf
 
Baracuda wrote:
I recently took photos with my Nikon D4s of a artist friend's acrylic paintings, using a ProFoto flash indoors on a tripod. I then opened each .jpg file with the Windows 10 Photo app (one of the picture tools) and did a quick edit of adjusting light brightness and a few contrast, then I cropped the image to have good clean sides.

When she opened them up on her computer, she noticed a very light screen effect, some with faint vertical lines (very subtle) alternating in lighter and darker streaks. It's almost a registration ghost image.
What did I do wrong? AND >>> How do I fix this? Do I need to edit in Elements or something else?

Another way of describing this effect is if you carefully laid down corduroy trousers down on the painting before it was completely dry and pulled them off. This is what you get. You have to look at the image closely and know that there is NO pattern like that on painting (not brush strokes)
I recently took photos with my Nikon D4s of a arti... (show quote)


Apparently you are seeing the canvas texture. Try diffusing our flash.

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Aug 16, 2016 11:50:30   #
Baracuda Loc: Kentucky
 
More information
This effect only shows up when I crop the image
It is not a weave detail - I checked original file and actual painting

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Aug 16, 2016 12:03:18   #
jcboy3
 
The problem is that your are using a D4s, which only has 16mp; when you crop to square format you lose 1/3, so you have only 12mp. Not enough resolution, and so last decade. But I can help you with that; I'll trade you my 24mp D7100, and throw in the battery grip (to account for the built in battery grip of the D4s). That will get you 16 mp on the image (a 50% improvement), which should solve all of your problems.

And I'll provide free consultation on any other gear you might need...remember there's no problem that can't be put off by buying more gear and waiting for the Brown Truck to deliver it.

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Aug 16, 2016 12:18:27   #
hcmcdole
 
I have enlarged my browser window 500% and cannot see the faint vertical lines. The only thing I see is either a dust spot (upper left hand quadrant) or an oil spot on the painting itself. Can you send the full sized crop so we can all see the pattern you are seeing as Jerry suggested?

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Aug 16, 2016 12:29:39   #
jcboy3
 
hcmcdole wrote:
I have enlarged my browser window 500% and cannot see the faint vertical lines. The only thing I see is either a dust spot (upper left hand quadrant) or an oil spot on the painting itself. Can you send the full sized crop so we can all see the pattern you are seeing as Jerry suggested?


I think that's all he's getting out of the D4s. Need more pixels!!!

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Aug 16, 2016 12:36:30   #
ebbote Loc: Hockley, Texas
 
I blew it up 500%, it is definitely the texture of the canvas Baracuda. I paint with oils, so I have some knowledge.

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Aug 16, 2016 12:45:50   #
HarryBinNC Loc: Blue Ridge Mtns, No.Carolina, USA
 
Baracuda wrote:
I recently took photos with my Nikon D4s of a artist friend's acrylic paintings, using a ProFoto flash indoors on a tripod. I then opened each .jpg file with the Windows 10 Photo app (one of the picture tools) and did a quick edit of adjusting light brightness and a few contrast, then I cropped the image to have good clean sides.

When she opened them up on her computer, she noticed a very light screen effect, some with faint vertical lines (very subtle) alternating in lighter and darker streaks. It's almost a registration ghost image.
What did I do wrong? AND >>> How do I fix this? Do I need to edit in Elements or something else?

Another way of describing this effect is if you carefully laid down corduroy trousers down on the painting before it was completely dry and pulled them off. This is what you get. You have to look at the image closely and know that there is NO like that on painting (not brush strokes)
I recently took photos with my Nikon D4s of a arti... (show quote)


What I am seeing in your image is a lot of jpg artifacts - this is typical of low quality jpg images, especially when they have been cropped, over-processed, and/or saved at low quality. If you carefully examine your image (as delivered to the forum) at high magnification, you will see horizontal components in the artifacts as well as vertical. In fact, you should also see that what you are looking at is actually a regular checkerboard pattern. You will also see a lot of smearing - this is also typical of low quality jpgs. Since you were using a very good camera to capture the images in the first place, I have to think that the destruction of the image happened in the processing stage, and was made worse by the compression/file downsizing that happens to images sent to the forum. It would be good to send us a RAW image that could be evaluated fairly.

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Aug 16, 2016 21:06:41   #
Baracuda Loc: Kentucky
 
Here is a STORED ORIGINAL for better study

This first image (12MB) is the ORIGINAL file, not the one with lines
Second image (2 MB) is the problem
Again, it is NOT the texture of the canvas and probably not the lighting because it does not show up on original (I don't think)

Thanks to all!


(Download)


(Download)

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Aug 16, 2016 21:08:38   #
Baracuda Loc: Kentucky
 
I did not use RAW files on nthis project but have just posted the 12 MB image

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Aug 16, 2016 21:09:28   #
Baracuda Loc: Kentucky
 
Thanks - I may have to re-take these images with lower lighting

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Aug 16, 2016 21:11:03   #
Baracuda Loc: Kentucky
 
Thanks for the offer, but I would not be able to use my Subal underwater housing on the D7100!

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