Purple Tinge on ND images
May 25, 2019 10:16:58 #
Screamin Scott wrote:
What filter size and what brand were the ones you used?
100x100 Vu
May 25, 2019 10:21:30 #
kenzlenz wrote:
This week I was shooting a waterfall using a 4 stop ND filter. When I got to looking at the RAW files I found a purple tinge on a number of them. What causes it and how do I correct it in PS?
When I first got my Breakthrough ND filter I had the same issue. I called the company and they told me to close off any outside light sources, so close the viewfinder with a covering of some type and that should take care of it unless your camera is leaking light somehow.
May 25, 2019 10:26:04 #
May 25, 2019 10:27:42 #
Thanks for the tip. My D800 has a "door" on the viewfinder which I have not used . I will try that.
May 25, 2019 11:39:00 #
May 25, 2019 11:55:05 #
B&H photo had the Vu filters on clearance as they are changing the packaging! Bought several and saved Hundreds! Not sure if any are left. Incredible filters Schott glass!
kenzlenz wrote:
The filters that I use are the Vu ND filters. What WB settings would you use in this case?
May 25, 2019 12:33:57 #
kenzlenz wrote:
This week I was shooting a waterfall using a 4 stop ND filter. When I got to looking at the RAW files I found a purple tinge on a number of them. What causes it and how do I correct it in PS?
What brand?
Different brands vary.
May 25, 2019 13:22:52 #
Vu filters, the 3 stop and the GND 2 stop work fine. It is the 4 Stop and the 10 Stop that I am having problems with.
May 25, 2019 13:30:03 #
kenzlenz wrote:
Vu filters, the 3 stop and the GND 2 stop work fine. It is the 4 Stop and the 10 Stop that I am having problems with.
Those seem to be inexpensive filters and QC might vary a bit more than some higher priced versions of the same.
May 25, 2019 14:16:30 #
kenzlenz wrote:
This week I was shooting a waterfall using a 4 stop ND filter. When I got to looking at the RAW files I found a purple tinge on a number of them. What causes it and how do I correct it in PS?
Its caused by the filter you used, a lot of the cheaper brands ( as well as some higher priced one's, like Lee), have strong color cast's! If you have access to PS, its relatively simple to remove, just go into the color channels and use the appropriate slider!
May 26, 2019 11:27:37 #
Jul 19, 2019 12:25:46 #
It has been awhile since I posted this issue. I when out last week and shot a number of waterfalls with the ND filters. I shot half with the viewpiece open and half with the viewpiece shuttered and the shuttered images were tinge free. Thank for the tip.
Ken Weaver
Ken Weaver
Jul 19, 2019 20:01:19 #
kenzlenz wrote:
This week I was shooting a waterfall using a 4 stop ND filter. When I got to looking at the RAW files I found a purple tinge on a number of them. What causes it and how do I correct it in PS?
[deleted]
Jul 20, 2019 10:40:02 #
Gene51 wrote:
If a simple WB adjustment is all that is needed, a 'raw' file is not necessary ..... a JPEG file can also be adjusted and saved to get good results, as long as the original save and the replacement saved are done at minimal compression {maximal quality}.If you shoot raw and use average white balance, it is easy enough to correct a color cast in post processing. But if you have two different color light sources, that will be a little harder, but not impossible.
Jul 20, 2019 11:23:04 #
larryepage
Loc: North Texas area
kenzlenz wrote:
Color cast is the right term. I tried the WB dropper in ACR and also tried adjusting the WB slider....cast is still there. I typically shot in Auto WB but happened to shoot in Sunny.....would that make a difference?
Was the purple tint in the shady areas? If so, there is nothing "wrong," it's just a case of two different lighting types in the same scene. Remember...in sunlight, your subject is lit by both the slightly yellow light from the sun and the blue light from the sky. Subjects in shaded areas are lit only by the heavily blue tinted light from the sky. It's usually around 8200K or so, compared to the 5600-5800K of sunlight.
If it is the whole image, remember that most custom white balance controls offer adjustment on two axes...the primary blue-yellow/red one that we always remember and the secondary violet-green one that we a lot of times forget.
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