rv8striker Loc: St. Louis, MO area

Any ideas why there are white lines on this image? It has happened with others too but not all. Stacked image using Affinity, processed in Lightroom.

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lamiaceae Loc: San Luis Obispo County, CA

Guess, a remnant of the stacking process. Something on the sensor would be dark as it blocks light.

Is it an older digital camera? Hot Pixels perhaps. I've seen those but they crossed the entire frame in a line.

lamiaceae Loc: San Luis Obispo County, CA

Oh, and by-the-way, it is a nice photo of a yellow rose. You can remove the line with your Affinity PP software. I know two ways I could do it with Ps, but you are using Affinity.

rv8striker Loc: St. Louis, MO area

Thanks for your input. I removed the lines when I first saw them but want to determine the cause.

lamiaceae Loc: San Luis Obispo County, CA

That may remain a mystery.

Manglesphoto Loc: 70 miles south of St.Louis

I gave had that happen when stacking but usually with stacks over 15 images. I don't have a clue as to the exact cause.

sippyjug104 Loc: Missouri

It appears to be a "hot pixel" on the sensor. The change in DOF of the individual shots cause the pixel to appear in a different position in each of the shots and it produces the white line when they are stacked.

I can see by the ghosting around the flower how much the focus changed as the lens advanced taking shots in the stack which also leads me to believe that it is a hot pixel creating the illusion of a white line.

rv8striker Loc: St. Louis, MO area

Thank you Sippy. If anyone on this forum knows about stacking it would be you. So now the question is how to avoid hot pixels? I took the stack with a minimum interval between exposures to avoid any movement of the rose caused by wind. Would a longer interval help avoid the issue?

JimH123 Loc: Morgan Hill, CA

This is not a hot pixel. It is too wide. Do you see anything on any of the individual images that make up the stack? How many images in the stack? What SW is used to make the stack? Part of the streak is wider. This doesn't make sense.

JimH123 Loc: Morgan Hill, CA

I have done a lot of stacking and have never seen a problem like this. Can you look closely at the individual photos that make up the stack? Can you see anything? How many photos in the stack? And you say you have seen this before? Part of the streak is two pixels wide. And there is that funny segment that skips a few pixels.

And hot pixels are usually red, or green or blue since those are the colors of the CFA that covers the sensor.
For this to be a hot sensor, it would mean that you have taken a tremendous number of shots and that the camera or the flower was moving in a very straight line. This doesn't happen.

Can you post a couple of the individual photos that went into this stack?

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SalvageDiver Loc: Huntington Beach CA

The first place to look is the stacking process, not sensor problems like hot pixels.

The first thing to do would be to check each individual image for that white line. If it doesn't exist in any of the individual images, you can rule out the sensor. If it is, then you can rule in the sensor as the problem. However, hot pixels are individual pixels, not a line of pixels and generally will be present in all images.

The stacking process involves, algorithmically, finding the sharpest portions of each image, creating masks blocking the unsharp part of those images and finally blending the sharp portions of each together into a single image. All it takes is for a slight misalignment error in the stacking algorithm to create an anomoly.

To check the algorithm remove one image from the stack and redo it. If it disappears, then you know the problem lies with Infinity. Another way to check, would be stack with another editor, such as photoshop.