Dead/Hot Pixel test software

[defordphoto]

Pretty neat! Works on all cameras.

http://www.starzen.com/imaging/deadpixeltest.htm

I had zero dead and 4 hot in the MKII. I never shoot long, so I'll never see the hot pixels.

[nucki]

Pretty neat! Works on all cameras.

http://www.starzen.com/imaging/deadpixeltest.htm

I had zero dead and 4 hot in the MKII. I never shoot long, so I'll never see the hot pixels.

Hi Jim!

thats really a neat software. I've done the test and found out, that there are several hotpixels and unfortunatelly also dead pixels. but, the dead pixels only appear at shutter speeds more than 1minute. but why are they not dead under 1 minute? isnt dead equal dead? or am I wrong?

Peter

[defordphoto]

I have no idea...Maybe they just get tired after about a minute or so! ;)

I don't measurebate my equipment so really could care less about it too much. I ran the test on mine and it's fine. I'll never run it again. No need to. There will be some obsessive-compulsives out there that will run this test weekly.

Don't worry about it and get out and shoot. :)

[Jim_T]

thats really a neat software. I've done the test and found out, that there are several hotpixels and unfortunatelly also dead pixels. but, the dead pixels only appear at shutter speeds more than 1minute. but why are they not dead under 1 minute? isnt dead equal dead? or am I wrong?
Peter

I think 'dead' means the CMOS sensor site isn't reproducing what it sees. It doesn't necessarily mean there are non working parts on the sensor.

'Dead' pixels increase with time. If you do a 10 minute exposure, you'll find that you have thousands of 'dead' pixels. This is just a weakness in the CMOS sensor.. When active, some sensor sites build up a charge over time. They eventually reach a point where they become 'saturated' and stop working.. When that happens you get your 'dead' pixels that show up as light spots in dark images.

The good thing is that the sensor sites return to normal after the power is removed.... It just happens with long exposures and it's normal.

[defordphoto]

'Dead' pixels increase with time. If you do a 10 minute exposure, you'll find that you have thousands of 'dead' pixels.

I have no idea...Maybe they just get tired after about a minute or so! ;)

Ahhhh...so I was right! :lol:

[Jim_T]

Ahhhh...so I was right! :lol:


LOL.. Yes you were :)

[AzzKicker]

Why would you want to know anyway. Its better to not know they are there than to know they are there.

When I had my G3 I ran one of those and it was the worst thing I could have done. Because after finding 4 dead pixels It bugged the shyt out of me. To the point I was always depressed when looking at their locations. I never noticed them until running those dead pixel finding software

[theflyingkiwi]

I found this software before I got my 10D, on the site that I found it also had some tests that one should do, when one gets a new camera. and this naturally is a test to run.

I think it would be ok, if you have just brought yourself a new camera, it is good to know that there are not any manufacturing defects with the CMOS sensor.

Other than that, anyone that do a test on a regular basis is an idiot IMO.

[defordphoto]

Why would you want to know anyway. Its better to not know they are there than to know they are there.

This is a tool to check your camera, especially when new. Nothing else. Like I said above, some people obsess over this stuff. But, when receiving a new camera you should do focus tests, pixel tests, etc. so you know if it's working up to specs. After that, get out and shoot some photographs

[Liang]

Is this tool accurate?
I tested and result is 0 dead pixel and 0 hot pixel.

[DReb-MO]

You should be feeling pretty good. I had the same results over exposures from 1/30 to 2 seconds.

[defordphoto]

Yes, it's supposed to be accurate. Most cameras test 0/0 until you start getting into the 30-second to 5 minute ranges. Then things can get ugly quick. You start getting in those ranges (I tested my MKII to 3:00) all cameras will read some hot, some dead.

[sandro9mm]

I've 2 hot pixels on the long exposure... no dead ones, 30D is brand new... should I worry?

[hmhm]

I think it's best to focus on the 8 million or so capable and hard-working pixels instead of fixating on a few bad ones.

It's an imperfect universe. I bet the floor is really dirty behind your refrigerator. Why go out of your way to shine a spotlight on it?
-harry

[adas]

I use the Photoshop Histogram and Levels as the hot pixel testing tool combo, as it's way more intuitive and gives you the colors of those hot pixels too.
I only have 1 red hot pixel, I guess I'm lucky, but I could leave with 10 hot pixels too. Still, I wouldn't accept 10 DEAD pixels tho.

[sandro9mm]

:)

under 5 sec exposure I cant see anything, over 10sec I get one and at 30sec I get two.

I shouldn't have tested it at all...

my hoties are white :)

[jpvaz]

BLOODY HELL !!!!!!!!!

I didn't read the instructions..... (stupid me) and opened a photo of a falcon that i made 2 weeks ago.... after the test i got 46 dead pixels and well over 2.8 milion hot pixels !!!

xix..... almoust had a heart atack.... i have to follow the instructions and re-test now....

1st.... recover from this and get the blood pumping again.... then i'll test it the right way.... i've got to learn to read the instructions 1st.....

[sandro9mm]

jpvaz
put the lans cap on, close viewfinder, shoot 1sec 5sec 10sec 30sec - tes with software thats it :D

[sandro9mm]

http://img85.imageshack.us/img85/9633/untitled1cw0.jpg
30sec... arghh!!

[MDJAK]

I ran the test with bulb mode. I left it in that mode for 30 minutes and had no dead, dying, hot, warm, or cold pixels.

I hope when I sell my camera one day, some sleuth will harken back to this post of mine and pay more for it.:lol:

mark

[EOS mE]

i don't have any dead pixel.. only hot pixels. don't know if it was because i was handholding it at 4sec or not; but that got me 10 hot ones. then at 2sec, it got me 9 hot ones and less and less as the shutter speed was shorten. at 1/30 it got me 2 hot ones.

is that normal to hot rather than dead?

EDIT: Congrats Sandro on your 30D.. i c she's arrived eh?

[sandro9mm]

EOS mE
thx :D yes, shes home, safe and comfortable :D

I think hot pixels on 1/30 is weird, some people say sensor cleaning did the trick :S

[EOS mE]

EOS mE
thx :D yes, shes home, safe and comfortable :D

I think hot pixels on 1/30 is weird, some people say sensor cleaning did the trick :S


yeah that's what i thought too. i'm compiling a list of what to buy from B&H... and rocket blower (large) is on that list.

[Billginthekeys]

i havnt run the software, but i know my 20D has a few hot pixels. doesnt bother me though. when i do long exposures it takes a few seconds in photoshop to wave them goodbye. just a fact of life that most cameras are going to have them. nothing worth getting worked up over.

[APG-Angus]

This is not only a great tool it is a great thread. Hot pixels never bothered me had a few on my 20D and Lightroom always removed so fast I rarely ever noticed them, except doing long exposure night sky work. This can be hazardous, I have a 8-month old 5dm2 and because I have been using LR never noticed hot pixels. I had another sensor issue that caused me to have to send it in for repair (nasty bloom in the corner) this showed up on 10 second exposures or longer, after 2 trips to Canon it was fixed, complete recal no replacement parts. I was suspicious so I put it through full tests and in short found that I had 958 dead pixels, 4305 hot pixels! this right after leaving the Canon repair shop! I did the Manual cleaning mode with cap on trick for 5 mn and the counts reduced to 25 dead, 1390 hot.:confused:

Tell me how does a camera in this condition ever leave a repair shop, I have a work order ticket that says :rolleyes::rolleyes:
contacts and all connecting items repair
a complete repair and return all functions to factory spec
1. electronic, mechanical analysis; corrections and adjustments; address values adjusted
auto focus test, check, recalibration and realignment
software download, test, check and complete recalibration
general test, check, clean and repair all function and systems
Good news is that the dealer is ordering a new camera, just have to wait for it to be shipped.:cool::cool: