Steve'sDigicams

Tullio · Feb 9, 2012, 10:56 PM

Pictures taken in Lake Tahoe, CA. The second is my son (3 years ago) having fun in the frigid lake water.

calr · Feb 10, 2012, 11:10 AM

Two excellent photos. However the first shows the red problem with the canoe/kayak on the left end. The red appears to be over saturated and some detail is lost.

Cal

Tullio · Feb 10, 2012, 3:16 PM

Thanks, Cal. This exercise is actually bringing up something strange. This canoe picture below was taken right before the one I posted first. Comparing the EXIF data I see that I made some changes to the camera settings between the two shots. On the first shot (above), there was no gain control, contrast=low and saturation = normal. The shot below, gain control was low gain up, contrast=high and saturation=high. Even though saturation was set to high, the image seem less saturated and I can see more details on the red canoe. I also noticed that the ISO and shutter speed were different between the two shots. The shot below has a higher ISO and faster shutter speed than the photo above.

Curmudgeon · Feb 11, 2012, 12:37 AM

Could be post processing or you can get strange color shifts in the red spectrum when converting from Adobe RGB to sRGB for web publishing.

Tullio · Feb 11, 2012, 10:02 AM

The thing is, I haven't PP'ed these images in terms of saturation/exposure. I only changed camera settings prior to taking the shots and cropped them in Picasa.

selvin · Feb 11, 2012, 7:05 PM

I have also noticed that a faster shutter speed and/or larger f-stop will result in less saturation and more details.

Feb 9, 2012, 10:56 PM	#1
Tullio Senior Member Join Date: Jan 2006 Posts: 6,898	Seeing red: As well as blue, yellow,... Pictures taken in Lake Tahoe, CA. The second is my son (3 years ago) having fun in the frigid lake water. Attached Images __________________ Tullio

Feb 10, 2012, 3:16 PM	#3
Tullio Senior Member Join Date: Jan 2006 Posts: 6,898	Thanks, Cal. This exercise is actually bringing up something strange. This canoe picture below was taken right before the one I posted first. Comparing the EXIF data I see that I made some changes to the camera settings between the two shots. On the first shot (above), there was no gain control, contrast=low and saturation = normal. The shot below, gain control was low gain up, contrast=high and saturation=high. Even though saturation was set to high, the image seem less saturated and I can see more details on the red canoe. I also noticed that the ISO and shutter speed were different between the two shots. The shot below has a higher ISO and faster shutter speed than the photo above. Attached Images __________________ Tullio

Feb 11, 2012, 10:02 AM	#5
Tullio Senior Member Join Date: Jan 2006 Posts: 6,898	The thing is, I haven't PP'ed these images in terms of saturation/exposure. I only changed camera settings prior to taking the shots and cropped them in Picasa. __________________ Tullio

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Feb 10, 2012, 11:10 AM	#2
calr Moderator Join Date: Sep 2003 Location: Beaverton, OR Posts: 7,929	Two excellent photos. However the first shows the red problem with the canoe/kayak on the left end. The red appears to be over saturated and some detail is lost. Cal

Feb 11, 2012, 12:37 AM	#4
Curmudgeon Senior Member Join Date: Mar 2005 Location: East Bay, San Francisco, CA Posts: 649	Could be post processing or you can get strange color shifts in the red spectrum when converting from Adobe RGB to sRGB for web publishing.

Feb 11, 2012, 7:05 PM	#6
selvin Moderator Join Date: Aug 2002 Posts: 6,214	I have also noticed that a faster shutter speed and/or larger f-stop will result in less saturation and more details.