PHOTO: Butterfly. Artifacting when viewed at full size

Displaying 1 to 5 of 5 matches.
focusphotoart
Member is a contributor and has less than 250 Photo downloadsMember is a contributor and has less than 250 Video downloadsExclusive iStockphoto Videographer
Posted Sun Dec 30, 2012 7:23PM
how to correct this file from rejection reason to resubmit, anyone please tell me any triq that improve the image quality for resubmit

Link: http://dl.dropbox.com/u/62428645/DSC_0101.jpg

http://www.istockphoto.com/resubmit_rejected_file.php?RejectedFileID=22535832


rejection reason was: This file contains artifacting when viewed at full size. This technical issue is commonly created by the quality settings in-camera, in post-processing, in RAW settings or scanner settings. Artifacting can also be introduced into an image from the result of other factors such as excessive level adjustments. 


A little bit more about compression: The JPEG file format uses a lossy compression method. In order to make the file smaller, information is thrown away, or lost. The quality setting that most image editing programs and digital cameras have when saving JPEGs determines how much information is lost. At a certain point with lower quality settings the removal of information during the compression process can become visible in the form of compression artifacts (places in the image where too much detail has been lost). Too much JPEG compression can become visible either in the form of a general loss of detail, or grainy/patterned areas (especially in flat spaces, such as skies). 

Compression artifacting can be introduced by the camera and/or by your image editing software at lower quality settings. Also, re-sizing, re-sampling, and re-saving can all degrade the quality of a JPEG image, so one should be careful about re-saving JPEGs. If for example, a photo was re-saved 4 times (even at a quality of 12 or Best) the image quality will become worse each time as pixel information is thrown out each time the file is saved. With this in mind, it is obviously best to start with the cleanest image possible. You may want to double-check your camera settings to make sure it is saving at the highest quality. If you continue to have issues you may try shooting in RAW/NEF mode, export to TIFF and then save as JPEG at the highest possible quality (level 12) with minimal or no post processing effects. Sometimes even trying a new RAW converter could be beneficial. 

Noise (pixels of varying color where there shouldn?t be) is most commonly created by digital cameras, especially in darker shadows or under low-light conditions and exacerbates the compression issues mentioned above. You might want to double-check to make sure that your camera?s ISO/ASA setting is at the lowest number (usually 100). In digital cameras, higher numbers (200 or 400) will always result in more noise (just as with film)

(Edited on 2012-12-31 03:05:27 by kelvinjay)

(Edited on 2013-01-07 10:46:47 by kelvinjay)
cmannphoto
Member is a Gold contributor and has 10,000 - 24,999 Photo downloadsExclusive
Posted Sun Dec 30, 2012 7:45PM

Cannot tell anything from the thumbnail, you need to post a full size image.


READ ME


 





 
focusphotoart
Member is a contributor and has less than 250 Photo downloadsMember is a contributor and has less than 250 Video downloadsExclusive iStockphoto Videographer
Posted Mon Jan 7, 2013 10:22AM
here is my large size image in dropbox, please check and guide me....http://dl.dropbox.com/u/62428645/DSC_0101.jpg
kbwills
Member is a Silver contributor and has 2,500 - 9,999 Photo downloadsMember is a contributor and has less than 250 Video downloadsExclusiveExclusive iStockphoto Videographer
Posted Mon Jan 7, 2013 11:55AM

link


There are pretty obvious square-edged pixelation effects in the background bokeh.  Also some (probably compression) artifcts along the leading edge of teh wing.


REGARDS


 
esp_imaging
Member is a Gold contributor and has 10,000 - 24,999 Photo downloadsExclusive
Posted Mon Jan 7, 2013 2:42PM

^ agreed, lots of artifacting, looks as though the file hasn't been saved at especially high quality somewhere during processing.

I think there may have been excessive sharpening applied to a slightly soft image too.

The stem of the plant at the bottom left looks weird - it is reddish but has a green outline, pehaps as though there has been a lot of fill light added, and/or some strong colour adjustments (maybe separate curves adjustments for each colour channel??)


 


 
This thread has been locked.
Displaying 1 to 5 of 5 matches.
Not a member?Join
Cart (0)