21 June : Ha with SHG

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DSobserver
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21 June : Ha with SHG

Post by DSobserver » Sat Jun 21, 2014 10:33 am

After some improvement with focus and a thinner slit (and more visible dust.....) the SHG start to show good pictures :


Image

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Re: 21 June : Ha with SHG

Post by alex » Sat Jun 21, 2014 11:25 am

Looking good!

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Re: 21 June : Ha with SHG

Post by marktownley » Sat Jun 21, 2014 11:30 am

That's getting there! Good job! :cool:
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Re: 21 June : Ha with SHG

Post by swisswalter » Sat Jun 21, 2014 3:59 pm

Hi Vincent

that looks very good, congratulations
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Re: 21 June : Ha with SHG

Post by Wah » Sat Jun 21, 2014 6:58 pm

Great improvement
Can you show me the B/W version? I can help you to remove bands~

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Re: 21 June : Ha with SHG

Post by DSobserver » Sat Jun 21, 2014 8:01 pm

here it is : http://hpics.li/3ac2119

I'll try to clean my slit, but can you explain how you treat those pictures for the line, 'cause as already discussed FFT was not enought good....

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Re: 21 June : Ha with SHG

Post by p_zetner » Sun Jun 22, 2014 1:40 am

Excellent image, Vincent!

Cheers.
Peter.

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Re: 21 June : Ha with SHG

Post by Wah » Sun Jun 22, 2014 10:25 am

DSobserver wrote:here it is : http://hpics.li/3ac2119

I'll try to clean my slit, but can you explain how you treat those pictures for the line, 'cause as already discussed FFT was not enought good....
Dear DSobserver,

I wrote a document about my experience using Photoshop to process the SHG images, you may find it in the library of the forum.
Here is the band removed version, hope you like it.

Wah!
Attachments
855010085533registrait_4_Resized.png
855010085533registrait_4_Resized.png (283.35 KiB) Viewed 1781 times
Last edited by Wah on Sun Jun 22, 2014 2:40 pm, edited 1 time in total.

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Re: 21 June : Ha with SHG

Post by DSobserver » Sun Jun 22, 2014 12:23 pm

waouuuuhhh wahhhh!!!!!

Looks great!

But now I've a new issue : this morning I try to clean the slit with pressure air and a wooden tooth stick. Dark line desapeare, but clear one appear! It probably come from the fact that dark line were probably coming from pieces of metal on the slit that I remove....

Image

Did you ever try to polish your slit from surplus shed? Any recommendation?

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Re: 21 June : Ha with SHG

Post by Wah » Sun Jun 22, 2014 1:32 pm

I didn't try to polish the slit because I am afraid of making it worse.
I just use a tooth stick to try to remove a much dust as I can.
By using the artificial flat field, the horizontal bands can be removed quite well.
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Re: 21 June : Ha with SHG

Post by DSobserver » Sun Jun 22, 2014 2:15 pm

so same treatment as dark line?
I don't have Photoshop...Do you know if GIMP or imageJ can do it?

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Re: 21 June : Ha with SHG

Post by Wah » Sun Jun 22, 2014 2:21 pm

The procedures should be similar, just need layer mask + blending operations and division between 2 pictures.

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Re: 21 June : Ha with SHG

Post by alex » Sun Jun 22, 2014 4:54 pm

I think GIMP should do the job.

However last December Adobe released for free the CS2 version of Photoshop.

http://www.techspot.com/downloads/3689- ... p-cs2.html

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Re: 21 June : Ha with SHG

Post by p_zetner » Sun Jun 22, 2014 6:08 pm

Alex, Wah and Vincent:

I doubt that Photoshop CS2 has a "divide" blending mode. I have CS4 which doesn't have this feature. ImageJ has a versatile "image calculator" function which allows you to load two images and subtract, divide, etc. I've had varying success with it, partly because I don't have Wah's finesse in treating the images!

Peter.

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Re: 21 June : Ha with SHG

Post by Wah » Mon Jun 23, 2014 12:17 am

Peter,
Can you find divide function in "apply image" in CS4?
Wah!

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Re: 21 June : Ha with SHG

Post by Montana » Mon Jun 23, 2014 1:17 pm

These images are superb with or without bands :bow :bow :bow

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Re: 21 June : Ha with SHG

Post by Phil Rousselle » Tue Jul 22, 2014 9:18 am

Hi DSobserver,
Are you a new SHG maker/user ?
well, nice pictures and processing

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