Pink Square

O

ozan

Well-known member
K, this is kinda hard to explain… But I’ll try my best

I started to notice a problem with my DVX100A and others. There is a pink saturated, fuzzy square box located in the upper right corner of the screen. I've attached "mock" 720x480 image example of what it looks like. It can be noticed with certain situations and colors that u film. However, u can see it best on different color shades of reds, oranges, browns, grays, blues etc… To make sure I wasn’t going crazy... I've tested 10 other DVX’s and noticed they all have the same problem. Three of them were “new” from a box, 4 from friends and the rest from different rental houses.

http://www.ozanbiron.com/pinksquare.jpg

Has anyone else noticed this problem? Wat do i do cause its bugging me everytime i film.
 
I encountered this problem in one shot I took but mine was centered in the frame...it showed up against a blue sky but wasn't really pink...just the faint outline of a rectangle...wasn't able to repeat it. Weird.
 
Am I the only one afraid to click the link? :undecided I want to, but I am afraid.

WHERE IS TC????? He can go first.

heh! I feel silly...its just a pink square. A harmless pink square. There is no zombie there. Many thanks, and I hope the pink thing goes away. I never had it happen to me before.
 
K people.... i looked at another 2 more DVX's and they all have the same thing!

Wats going on!
 
its been talked about and noticed since the first people to have dvxs noticed it. generally its caused by the compression when your looking at a large are that has a somewhat constant tone or color to it like a flat white wall or a big patch of blue sky or a sold black area in the dark.. anyway .. its accentuated by shooting in too low of light. and is aleviated by not shooting scenes with a flat constant tonality in the upper right quadrant of the frame. my DVx has that too.. about all of them do. ..but ive only noticd it once when i first got it. and i was shooting at night with a large area of black in the sky.. and once i knew what it was and howto avoid and essentially completely eliminate it from ever showing up again.. i havnt seen it since
 
k, sooo how do i avoid it? wat do i need to "completely eliminate it from ever showing up again"
 
iamloser said:
generally its caused by the compression when your looking at a large are that has a somewhat constant tone or color to it like a flat white wall or a big patch of blue sky or a sold black area in the dark.. anyway .. its accentuated by shooting in too low of light. and is aleviated by not shooting scenes with a flat constant tonality in the upper right quadrant of the frame.
Click to expand...


..dont do the things that make it worse, and do the things that make it better.
i forgot .. i should have also mentioned that mine dissapeared all but entirely when i simply adjusted my master pedistal to the technically correct setting. .. on the DVX100 if your shooting at 0 IRE (which you should be) your MP should be at -6 .. if for some reason your shooting at 7.5 IRE it should be at -8. once i set this correctly..cause it wasnt set right fro the factory.. ive never seen it since unless im adjusting the MP higher and have to work in lower light. but the proper MP settings has kept the blacks black and the greys grey wioth no red patchy compression to be seen. :thumbsup:


anyhow if your MP is correct already.. and you need to shoot in low light.. or you need to have your MP incorrectly higher than it should be for your "look" or whatever. ..shoot with enough light, and dont shoot stuf with lower light levels and flat near constant tonality and light levels/luminosity ..espescially in the upper right quadrant of ther frame.

you can shoot a flat white wall filling the whole frame as long as your using enough light. as you drop the light levels down it will become more and more apparent. if the upper right hand corner is broken up from the flat near constant color it will also help to keep it from appearing down to even lower light levels . I personally have found that if the flattish tone/color area is brown or somewhat reddish.. it will accentuate the problem.,.so i stay away from that as well... well actually i never worry about it cause i tend to use enough light all the time. but if im in lower light for some reason, i do take it into consideration. ..keep in mind that since the block tends to be reddish it will be accentuated on NTSC TV playback sincew they tend to love red and show more reddish tonality. so for the test below i would reccomend running svideo or composite cable out to an NTSC TV so you can see the phenominon more easily.

you can do some testing to see this. do it both with the MP set correct and with it set higher. ..meaning above -6 for 0 IRE. try -3 or 0. aim the camera at a flatly lit whitish or whatever color wall. and make sure your exposure is ok. the wall should at read apx 80% on the marker. right then it should look fine and show no red blocky noise in the upper RH corner of the image if the wall is lit flat you will see the problem sooner as we continue. if the light on the wall varies it iwll take longer for it to appear because the compression wont be blocked all together as quick.
so no slowly close the iris on the camera bit by bit and you will se it start to appear and be more noticeable as the light gets lower and lower .



ive also noticed the red blockiness from compression in smaller areas of the image when shooting in very low light.. its not always the whole upper rh quadrant thats blocked.. somtimes its just little patches throughout the image. again the proper MP setting got rid of this for me. basically i think its noise caused mostly in the red channel from compression macroblocking, ..not sure why the upper rh corner does it the most.. it just does..

barry , do you remember if there was any resolution figuered out as to why the upper rh corner was favored? i dont.. i can guess though. maybe its an alien in your camera? yeah that sounds pretty likely. so ill go with that. anyway.. thats the way it is. and thats pretty much how you nip it in the butt.
 
Hmmm, it seems that if I set the MP to a lower setting like -6 the "PINK" square is more visible. I’m also setting the camera out of focus to make the square easier to see.

I did some more tests walking around with 2 DVX's with the images set out of focus ... it seems that "yes" in low light conditions it’s more visible! However, in outside or bright lit areas the square still visible depending on the background you are filming. I can still make out the outline when I pan the camera… though it’s very difficult to see.

I also filmed a brightly lit kitchen. The kitchen had a burgundy door. I paned from left to right... crossing over the door. As soon as the door reached the "upper right corner" the square becomes visible. I did the same thing but out of focus and "booya!" seems like this square is like permanently engraved!

blah, it’s starting to frustrate me! WHy is it that area out of the box is fine and looks normal? Why is this square or rectangle box there? Is this like a DEFECT or something? I also notice that with the regular DVX100 but was located in a differnt area.

I did a frame grab from another DVX and did some photoshop work... the image is kinda exaggerated to make it more visable! Its not a sqaure like mine... bUt more of a bar shape.


http://www.ozanbiron.com/pink5.jpg


....
 
..why is the image so grainy/noisy .. do you have the gain on? if so turn it off. i wouldnt even consider usin gain. so i wouldnt have though you would haveit on. but its definitely going to make it worse. just use enough light.. that image is way underexposed.


this was something that concerned me and alot of other people too when we noticed it, but if your usin enough light and dont have gain on and have correct MP setting your not ever going to notice it unless you are looking hard to find it.. and youll find anything if you look hard enough.
 
I never film using "GAIN"! Image is sooooo grainy/noisy because i ENHANCED the image in photoshop to make the pink more visable.
 
lol.. :) anyway i wouldnt worry about it.. id bet almost every DVX owner on this site has a camera that will do that if given the same conditions. cameras are made to record light.. give them too litte of it and they get funky.. and the compression like to be challeged .. or it seems to start to get lazy and macroblock.. giving us the phenominon you now bring up again after me not hearing anyone mention it after about almost 3 years or something. anyway .. id bet your going to notice it for a while now cause youll constantly be looking for it.. just let it go and id bet youll find that your the only one that ever sees it from your camera if you try to follow the guidlines i mentioned above. :)
 
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