JEL
Addon Developer
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- Apr 23, 2008
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http://www.grelf.net/
Aside from DeepSkyStacker, Grip is really useful. It can do many things that DSS cannot (they're not really comparable, except both can stack images)
Actually I find Grip more often makes errors when stacking in warp mode, but is better than DSS in the 2 other stacking-modes.
Anyway, both programs should be in your tool-box since both are amazing programs.
One single really useful thing in Grip is that you can export your images in 8 bit. For some reason DSS doesn't seem to have this option. But Grip can also do a lot of useful edits to your images, like removing light-pollution quite effectively from images, and neutralizing white-balances, and much more.
Grip was last updated in june and now does what DSS also does: extends the bit-depth as your number of stacked images increase.
I made a test to show this.
I took some pictures of the star Vega, and the 2 double-stars just left of it, and converted them into 1 bit images (pure black and white) and then stacked them.
On the image the first row (the green box) shows 3 different frame examples of Vega. Here you can see that even though the image is 1 bit only, each frame is still different. I stacked 100 of such 1 bit frames.
The second row (the red box) shows the final stacked image. As you can see the number of bits have been extended.
So not only is signal-to-noise-ratio (SNR) increased when stacking, even bit-depth is increased
The 2 next rows show the same example, only this time it's with the 2 double-stars found north-west of Vega (from Vega go towards Polaris)
This makes stacking highly recommended.
You probably already knew that but sometimes a re-iteration is a good thing, which is basically the purpose of this posting.
Remember to adjust the histogram after stacking and BEFORE converting your image into the 8 bit image.
In fact this is similar to doing HDR images (high dynamic range)
Grip has more indepth info on this (recommended read) here:
http://www.grelf.net/astro_exposure.html#accum
In fact the website has a ton of useful info if you're interested in astro-photography. And lots of the author's own astro-photos (and he's good )
Aside from DeepSkyStacker, Grip is really useful. It can do many things that DSS cannot (they're not really comparable, except both can stack images)
Actually I find Grip more often makes errors when stacking in warp mode, but is better than DSS in the 2 other stacking-modes.
Anyway, both programs should be in your tool-box since both are amazing programs.
One single really useful thing in Grip is that you can export your images in 8 bit. For some reason DSS doesn't seem to have this option. But Grip can also do a lot of useful edits to your images, like removing light-pollution quite effectively from images, and neutralizing white-balances, and much more.
Grip was last updated in june and now does what DSS also does: extends the bit-depth as your number of stacked images increase.
I made a test to show this.
I took some pictures of the star Vega, and the 2 double-stars just left of it, and converted them into 1 bit images (pure black and white) and then stacked them.
On the image the first row (the green box) shows 3 different frame examples of Vega. Here you can see that even though the image is 1 bit only, each frame is still different. I stacked 100 of such 1 bit frames.
The second row (the red box) shows the final stacked image. As you can see the number of bits have been extended.
So not only is signal-to-noise-ratio (SNR) increased when stacking, even bit-depth is increased
The 2 next rows show the same example, only this time it's with the 2 double-stars found north-west of Vega (from Vega go towards Polaris)
This makes stacking highly recommended.
You probably already knew that
but sometimes a re-iteration is a good thing, which is basically the purpose of this posting.Remember to adjust the histogram after stacking and BEFORE converting your image into the 8 bit image.
In fact this is similar to doing HDR images (high dynamic range)
Grip has more indepth info on this (recommended read) here:
http://www.grelf.net/astro_exposure.html#accum
In fact the website has a ton of useful info if you're interested in astro-photography. And lots of the author's own astro-photos (and he's good
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