cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Lines running down photos on Rebel T6i

meghanmoran
Apprentice

Hi everyone - I’m having a reoccurring issue where I’m getting a line running down/across my photos when I’m trying to shoot in lowlight indoors or at night. It looks yellow at first glance but when you zoom in it looks like red and white pixels. I’m not sure if it’s a camera issue or my settings, any ideas? 

4 REPLIES 4

Hello meghanmoran welcome to the forums. Can you please post a picture to show what's going on with your camera. Also can you post the EXIF data intact too. Please also list the lens and external flash (if used) too.

-Demetrius

EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM & EF 70-200mm F/2.8L IS III USM

EOS 40D & 5D Mark IV

430EX III-RT & 600EX II-RT

FBA0B431-14BA-4295-9997-3E86FB76F5DD.jpeg

I noticed that a high ISO was used. Leading to a noisy or grainy picture. What you're seeing is what are called hot pixels. That's what those red and white dots are in the picture. What mode was the camera used in. What lens was used to take this picture. 

-Demetrius

EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM & EF 70-200mm F/2.8L IS III USM

EOS 40D & 5D Mark IV

430EX III-RT & 600EX II-RT

Lotus7
Rising Star

I presume you're concerned about the single horizontal line of noisy pixels, not the "normal" high-ISO uniform "background" noise (technically: statistical quantum mottle) throughout the frame. 

Single "noise line"Single "noise line"I'm also presuming that you've tried another SD card AND the the "noise Line" is visible on the camera's LCD display (using display magnification to see the line) as well as on the exported data.  IF it is not visible on the LCD at high magnification, it may indicate a data transfer or data storage issue.

Is that line at the same location on every frame? On your sample image it's at 36.3 % of the vertical image space.  If it is always at the same location, and if it increases in intensity as you raise your ISO setting, it may be an indication of a failing image sensor.  More specifically (on a CMOS sensor) a "row analog processor" or "row decoder".  If it moves (occurs at random locations, It can indicate a failing clock circuit or interfering electronic noise from another source.  The image you posted has been compressed by the website so it's hard to see exactly what the data looks like, but at first glance it appears to be random variable intensity noise along one scan row only, even though the convolution filter applied in-camera to reduce (smooth) the normal sensor noise has spread the excessively noisy row out over 4 or 5 rows.

This "row only noise"  is not normal for your camera at ISO 6400.  Again, if it's always at the same location, it's most likely a physical issue in the sensor array.  If it occurs at a random location on successive frames, there are a multitude of possible causes including a faulty DIGIC 6 main processor.

Ideally, a RAW image data set should be checked, since any processing of the image such as converting it to a jpeg image will spatially filter the data and make it more difficult to determine what is actually happening. 

Announcements
01/18/2023: New firmware version 1.1.1 is available for EOS R6 Mark II
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version 1.0.5.1 is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
12/07/2022: New firmware version 1.7.0 is available for EOS R6
11/22/2022: New firmware available for EOS R3, EOS R7 and EOS R10
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/14/2022: New firmware version 1.0.1 is available for CR-X300
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.