Grimaldi
  • Member for 4 years, 11 months
  • Last seen more than a month ago
Photostacking - Why does this technique fail for my astrophotos?
6 votes

1) From the difference between median and max you can see that alignment didn't work and the pictures were not aligned. Why this is so, is hard to tell. Comparing the pictures in the tutorial with ...

View answer
Can all colors be described with RGB?
Accepted answer
6 votes

Have a look at this introduction to color perception and reproduction. It also contains a comparison of CIE, RGB and CMYK gamuts at the bottom, where CIE represents what the eye can do and RGB and ...

View answer
How can I improve my milky way photographs?
2 votes

Those pictures you’re trying to reproduce are using mounts to cancel earth rotation, stacking of multiple images and heavy postprocessing. A tutorial workflow can be seen here: https://pixinsight.com/...

View answer
Can 35mm film be developed if it's been ripped out of canister?
2 votes

If you've done this in absolute darkness and kept the film in absolute darkness: Yes, absolutely. If it received some light: no.

View answer
Is there an EASY way to get geotagging with a compact camera without GPS?
2 votes

The way I have done it in the past is this: Carry a handheld GPS, which records a GPS track Take your pictures, while carrying the GPS For best results, take a picture of your GPS displaying the ...

View answer
Linux software for stacking and RAW processing
2 votes

Take a look at the Discover Astronomy page over at Linux.com, which gives a comprehensive list.

View answer
What accuracy is needed for polar alignment when shooting time lapse of celestial objects?
Accepted answer
1 votes

A misalignment of 1'' leads to a drift of 0.23''/min when the telescope is pointing to the Zenit. See here (in german) Have a look at these formulas here

View answer
Why there is a ripple on my image?
Accepted answer
1 votes

This is called a Moire pattern and is created by the regular lines of the tiles in the photo interacting with the black grid between the pixels of any computer monitor.

View answer
Human (body or face) detection/recognition open source software?
1 votes

DigiKam has a facial recognition module.

View answer
Where does the light go when a lens with a larger image circle is projected on a smaller sensor?
1 votes

The light scatters around in the camera and reduces contrast by a diffuse light background. Often telescope tubes are fitted with black velvet, so that light is absorbed. This is reduced diffuse ...

View answer
How to get panorama using few photos warped properly?
1 votes

These "bends" might be from distortions from your camera's lens, which Hugin will have a hard time correcting for, if you supply only a limited number of pictures. Check the lens distortion parameters ...

View answer
How can I stitch images with the same center but different peripheral content?
1 votes

You can use Hugin to manually align pictures and you can define masks to define what parts of the pictures are going to be Excluded or stitched. See Hugin website

View answer
Are thermal imagers inherently more expensive than visible-light digital cameras?
0 votes

No, I can't see any physical constraints for mass production of IR sensors. In fact, most sensors in use in DLSRs are IR sensitive and have an IR filter, that means they are sensitive to wavelengths ...

View answer
Compact tripod on airplane (Europe)
0 votes

I would say it depends on a couple of things: does it have spikes or sharp edges? could it be used as a club? is it small enough (including your backpack) for carry-on luggage? I would ask at the ...

View answer
What problems might there be with using a laser as a flash source for high speed photography?
0 votes

A pinhole camera will give you primarily lots of interference rings with a laser. Try shining a Laserpointer at it. So you might have to to "decoherence" it somehow, or take this into account in ...

View answer
How can I align hundreds of images?
0 votes

Your're looking for a panaroma stitching software, which is able to do Gigapixels. If you google "How to create a gigapixel image", the usual suspects that turn up are (in no particular order): ...

View answer
Are the artifacts I am seeing with my Samyang 24mm f/1.4 typical?
0 votes

Most photos of good quality taken of the Milky Way are done using a telescope mount, which counteracts the apparent movement of the stars. In addition, the best ones also use stacking, that means ...

View answer
Preventing condensation on lens when shooting in a cold place
0 votes

Check out this discussion from Sky and telescope, which gives two options: Shielding and Warming

View answer
Can I show two sides of a card in one photo?
-1 votes

Make a hologram of your ID card. You have to walk to see both sides, but they will both be there.

View answer