Quote:
Originally Posted by dtvmcdonald
I DID add blue filter to the one on the right. The filter I added would
correct 4850K to 5250K. I probably should have used 6000K. I will redo.
Why not auto exposure? Because then the comparison would not be real.
This is VERY important ... if you use autoexposure it will automatically change
the color temperature setting.
Why defocus? This is very important! Its perfectly possible to
focus accurately. This means, using my camera, that the camera
resolves the individual color dots or rectangles. To get accurate color
rendition you then have to set the camera exposure so that the brightest
dots do not overload the sensor. This results in a VERY dark image!
So if you don't defocus the camera you have do the defocus
in Photoshop if you want the whole screen in one image 900 pixels
high or less so it can be posted on Videokarma. I have posted pics
of my CT-100 showing the dots clearly.
The Sony is two years old and is calibrated as best I can to about 6000K,
just using a test DVD. The Sony is identically calibrated at least
by intent.
Getting good pictures of color TVs is not easy! It is very much not a matter
of using auto settings on a camera!
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I feel it is just the opposite. I have been taking screenshots since the first Trinitron was introduced in 1968. I was so impressed with its picture quality that I was compelled to try and capture some of those images. In those days, all analogue and a crap shoot compared to digital imaging.
I try and make the room as dark as possible and then fill the image sensor with just the screen of the TV. Then the sensor is reading the light of the TV image only. I use auto settings and don't try and manipulate anything with Photoshop. Excuse me if I say this, but to me if you manipulate a photo, you are changing it up from what the camera sees. I read that you wanted to compensate because the color pixels seem to fool the camera.
If you use the same camera, the same dark room levels and use the same auto settings, to me that is the fairest way to create comparison digital screenshots. No manipulation to alter the captures.