Sony HS20 Color Uniformity/Purity Poll

TOM ,HI


before to set the gamma in factory its obliged select gamma 1 , 2 OR 3 in picture settings .


after its too hard to me !...............


excuse me for my very poor english but i m french .


GOOD LUCK

So I have been playing around with this and I am not getting very satisfying results. I loaded up ImageDirector and was able to see a visible change in the picture, but of course it is over the entire picture.


I have backed the gamma off on the red channel a few notches on the top 1/2 of the IRE scale, but it of course leaves the other half of the image semi-washed out.

It is frustrating.


I definitely see it during bright standard DVD material, and since we live in Oregon where a blue sky is a rare sight, my eye is drawn to it. Pan left to right and that's all I can focus on.


If the HS20 has a purity adjustment like described in the HS10, this would all be a moot point. We could just take out the red tint and life would be fantastic.


The question I have is should I have someone come out the a Colorfacts and see about tuning up the projector, should I return it or should I send it to Sony for repair?

OK, I'm making some progress but I need more help. I got the RGB, Position, and Level adjustments to appear. REUNION is correct. You must first select one of the Gamma Correction options in the user menu.


However, I ran across three problems in trying to fix the problem (Which is, by the way, excess red on the left side. The right side is fine).


1. There are 286 positions and 286 line intersections on the crosshatch. Therefore, each intersection must be a position. However, it's impossible to tell which is which. Which point on the screen is Position 120, for example?


2. I spent an hour adjusting RGB levels and then saving the changes. There was no measureable difference in color temp or RGB balance. Clearly, I'm doing something wrong.


3. The # of adjustments is impossibly large. There are three channels (RGB) for each position. There are 286 positions. Finally, there are 8 levels of gray 0 being the darkest, 7 being the brightest. As far as I can tell the red bias extends throughout the entire IRE range, so you would have to adjust all 8 levels. Depending upon how many positions required adjusting (if I can ever figure this out or get it to work), it's going to require hundreds of adjustments.


I hope that someone has something useful to add to this, because I'm stumped.

Yikes, is this what you guys are talking about? If it is, how does it not affect the picture? Also, does it go away once the projector warms up?


Thanks,


Frank T. Lee

Quote:
That is actually one of my screenshots. I used the 1:1 pixel mapping image, and used it as an background tile in Windows XP. The alignment problem of my HS-20 (about 1 pixel off on the right side) seems to increase the red bias.


You can find the original picture here:
http://home.online.no/~tklev/SonyHS20/AUT_3151.JPG


I can at least vouch for the image problem not being present in this form in my regular viewing experience. I can not notice it at all in regular movies.


My projector is mounted upside down, hence my right might be your left.


Try using the 1:1 testing pattern all over the screen, and see if you notice the same red bias as I do. I thought it was the same bias I had as you said you had, hence I voted for slight discoluration.


PS! There are a lot more screenshots from my HS-20 on my webpage, and I can not see the red bias in those shots:
http://home.online.no/~tklev/SonyHS20/


Regards,

Tore K.

Quote:
This picture is a bad example how the image is affected, it's test pattern, and your smaller sized attachment actually increases the red colorisation. The original picture you used is actually taken from my projector, and as stated, I have no problem with this red effecting usual images. (Just check out the pictures from Lord of the Rings or Ice Age.)


I have attached the BMP file I used as a testing background:

OK, I finally found that special service menu. There are lots of neat things there that I am very afraid of. I found the Gamma settings and made an interesting observation.


when Gamma1 was selected, I could see the Level, RGB, etc text. When I selected Gamma3, the text was missing. I had been messed around with the gamma3 setting using image director and now I don't get the text.


Do you think that setting Gamma3 using ImageDirector changed something, or does Gamma3 just not work for anybody? Has anyone tried putting the projector in service mode and firing up ImageDirector? Sony probably has different software for setting all those data points.l


I was going to call Sony tomorrow and I wonder if I should mention the service modes or not. I'm afraid that they will scream "Out of Warranty" if I touched anything. I was going to ask the important questions about that their specs are for dead pixels, color purity, etc. Wish me luck.


- Neal

Quote:
I belive what you see in that picture is due to the alignment problem I have on my projecter. The test-pattern I used on this picture consists of 1:1 pixels, one pixel black, one pixel white and so on. Due to the about 1 pixel out of alignment red, the red panel will in fact occupy the black portions of the test-pattern, and give the image a red push on that side. This is however a test-pattern, no regular images will have this kind of regular intervals of black/white dots, and in such instances the alignment problem will not be noticeable. I have tried seeing the problem with grey backgrounds, and I can not see that same problem there. Personally I can't even see a color uniformity problem on my HS-20 except on that test-pattern. I was thinking I saw I color uniformity problem because I was seeing the shift from white to a darker "grey" on my Internet explorer bar, but it turns out that this is actually a feature of the Internet Explorer program, and I notice it even on my CRT monitor I'm using now...


Regards,

Tore K.