Help!!! I'm freakin' out here! - DPChallenge Forums

Canon EF-S 10-22mm f/3.5-4.5 USM

11/29/2005 02:07:47 AM · #1

I was taking some shots with my black backdrop when I noticed these red and blue specks on my LCD screen. Upon closer inspection, they seem to be at the same spot everytime I shoot. Are these dead pixels???

Oh dear. Please tell me it ain't so.

These are straight out of the camera. Please tell me it's not what i think it is :(

mycelium

Canon EOS-350D Rebel XT

11/29/2005 02:13:09 AM · #2

first let me say I have no idea - I know very little about camera hardware - but I hope your camera is okay!!

Bear_Music

Samsung Galaxy S24 Ultra

Sony 24-70mm F4 Vario-Tessar T* FE OSS

11/29/2005 02:14:39 AM · #3

A certain number of dead pixels is to be expected. They can be mapped out. I'm not an expert at this. These may be what they call "hot pixels" anyway. I'm sure Kirbic will have more useful info when he chimes in.

R.

Sony 24-70mm F4 Vario-Tessar T* FE OSS

11/29/2005 02:15:32 AM · #4

does that mean the end of my open challenge entries that are set up in the studio where dark backgrounds are required?

Bear_Music

Samsung Galaxy S24 Ultra

11/29/2005 02:17:46 AM · #5

Originally posted by Rikki:

does that mean the end of my open challenge entries that are set up in the studio where dark backgrounds are required?

Not hardly. Nobody would notice these if you didn't point them out. You architetcs are all anal-compulsive perfectionists. Lighten up, jejejeâ�¢ Anyway if you DO have a problem, Canon can remap the sensor for you. They are all mapped out of the factory. No sensor ever made has 100% live pixels, there are millions of them on there and some will be defective.

R.

faidoi

Pentax K10D

Pentax DA 18-55mm f/3.5-5.6 AF

11/29/2005 02:19:36 AM · #6

I also see a white dot on the right side of the circle near the top.

11/29/2005 02:19:43 AM · #7

Originally posted by bear_music:

Yeah but since I started editing for tomorrow's challenge and the Free Study, I just realized this. Sheeesh! I'm all puckered up :)

Where's Fritz? LOL!

Panasonic Lumix G 14mm F2.5 ASPH

11/29/2005 02:20:59 AM · #8

Originally posted by faidoi:

I also see a white dot on the right side of the circle near the top.

Oh piece of S**T! I didn't even notice that one. And bear says I'm the anal one :P

Does anyone else have this problem?

Olyuzi

Panasonic Lumix DMC-GX7

11/29/2005 02:26:54 AM · #9

You may be able to download pixel mapping software off of the internet and do it yourself without sending your camera into Canon, which may have long turn around time at a time of the year when you need your camera.

How long are your shutter speeds with these shots. Usually, these hot pixels don't show up at normal shutter speeds.

You may be able to legally get rid of them using PS "dust and scratches" filter, since it will be applied to the entire image. Just use a very small radius and be careful that you aren't destroying detail in the process.

mesmeraj

11/29/2005 02:27:44 AM · #10

yeh Rikki quit being so anal :p

sometimes i get a white dot with a black outline in my images. I just clone them out. Uless it is basic, in which case, if i have ever used an image with one in no one has ever noticed... or said anything if they did.
Maybe thats why i get ones.

(btw, im one to talk about not being anal, i'm a virgo through and through)

11/29/2005 02:29:55 AM · #11

Originally posted by mesmeraj:

btw, im one to talk about not being anal, i'm a virgo through and through

september 18th baby :)

so i guess the hot pixel is cool? sheesh jkust knowing it's there will really bug the bejesus out of me :)

Panasonic Lumix G 14mm F2.5 ASPH

11/29/2005 02:30:51 AM · #12

Originally posted by Olyuzi:

Has anyone done this here before? I've been using shutter speeds around the 2-15 second range.

Olyuzi

Panasonic Lumix DMC-GX7

11/29/2005 02:36:16 AM · #13

Originally posted by Rikki:

Originally posted by Olyuzi:
You may be able to download pixel mapping software off of the internet and do it yourself without sending your camera into Canon, which may have long turn around time at a time of the year when you need your camera.

How long are your shutter speeds with these shots. Usually, these hot pixels don't show up at normal shutter speeds.

You may be able to legally get rid of them using PS "dust and scratches" filter, since it will be applied to the entire image. Just use a very small radius and be careful that you aren't destroying detail in the process.

Has anyone done this here before? I've been using shutter speeds around the 2-15 second range.

No wonder you're getting them at such long shutter speeds. That's normal and you probably don't need to do a pixel mapping. I highly doubt you'll see them with more normal speeds.

Art Roflmao

Canon EOS-6D Mark II

Canon EF 24-105mm f/4.0L IS

11/29/2005 02:47:47 AM · #14

Originally posted by Rikki:

Holy crap! Forget the hot or dead pixels - I would be much more concerned about those big red circles!!

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

11/29/2005 02:54:35 AM · #15

Originally posted by Art Roflmao:

Holy crap! Forget the hot or dead pixels - I would be much more concerned about those big red circles!!

Priceless!

sher

Canon EOS-300D Rebel

11/29/2005 03:26:00 AM · #16

there is a hot pixel in this shot but it didn't seem to matter much to voters. :)

fotomann_forever

11/29/2005 03:28:33 AM · #17

Originally posted by sher9204:

there is a hot pixel in this shot but it didn't seem to matter much to voters. :)

Which one? lol

sher

Canon EOS-300D Rebel

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

11/29/2005 03:34:03 AM · #18

Originally posted by fotomann_forever:

Originally posted by sher9204:

there is a hot pixel in this shot but it didn't seem to matter much to voters. :)

Which one? lol

lol...well, most of those are stars that showed up with the 30 sec. exposure. the hot pixel is red and almost dead center of the sky. :)

nsbca7

Mattel Barbie Photo Designer Digital Camera

11/29/2005 03:36:50 AM · #19

Originally posted by fotomann_forever:

Originally posted by sher9204:

there is a hot pixel in this shot but it didn't seem to matter much to voters. :)

Which one? lol

I thought that was Mars!!!

fotomann_forever

11/29/2005 03:37:55 AM · #20

I see the little booger now.

Apple iPhone 5

Nikon AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6 ED

11/29/2005 07:50:50 AM · #21

Originally posted by Rikki:

Has anyone done this here before? I've been using shutter speeds around the 2-15 second range.

Do you want to really freak yourself out? - Push the shutter speed up to 60 seconds or so.... :)

riot

Canon EOS-1D Mark IV

Helios 40-1 85mm f/1.5

11/29/2005 08:38:02 AM · #22

I regularly shoot exposures of around 5 or 6 minutes on my 20D, you get hot pixels galore, of both kinds (red/blue colour splodges and white dots with halos) but they really aren't noticeable when you resize to 640.

This shot had about 20 (obvious) hot pixels i had to clone out for print res, but it was a basic editing contest so i did nothing to it in this version, you can't really spot a single one. That was a 5 minute exposure.

Besides, the 20D has a rather nifty noise reduction custom function that will get rid of all these obvious bright spots, works for exposures 2 seconds upwards.

kirbic

Canon EOS R5

Canon RF 24-70mm f/2.8 L IS

11/29/2005 08:42:27 AM · #23

rikki, try turning on the long exposure noise reduction on your camera. the cam will take two exposures, the image, then another with the shutter closed. It will subtract this second "dark frame" from the image, and that should greatly reduce the hot pixels.