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Processing question for the Big Four!

Started by Fay, Oct 11, 2007, 09:49:36

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Fay

Please can you tell me, do you all pay a lot of attention to Gradient Removal & Dark & Light points when processing your images?
It seems such a lot of palaver, if it is neccessary, then I will study it in depth. If not, then....................!!!!?????%%****


Fay
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Rocket Pooch

If there is not gradient then no,

If there is then yes,

Bit of a chicken and egg question,

Fay, the thing to do is measure the black points in the image, you do this in AA by moving the mouse around, look at the values, if you have a consistantly higher ADU reading from one end of the frame than the other you have a gradient, you can then use a gradient removal tool to get rid of it.  http://www.msb-astroart.com/examples.htm

In AIP there is a measure tool to do this.

The big thing with gradient is they really mess up colour images, have a look at Roberts M27 with and without the gradients on the Gallery, you  will see what I mean.

Chris



P.S. who are the big 4?


Fay

Thanks Chris,

Big 4 = you, John, Chris, Paul


Nothing to do with big game!

Fay
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Fay

Yes, Chris, that M27 is a good example.

Thanks
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Rocket Pooch


Fay

Just testing, Space Dog, to see if you were alert, I meant Mike.



Fay
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Mike

Oooh i've not only got green stars now but i'm on eof the "Big Four". Cool !!  :)
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

Mike

Hey what the heck !! Where have my green stars gone ?! Dammit !
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

Rick

Your stars are green only in sections of the forum where you're a moderator. :)

JohnP

Quick & easy way to see if there is a gradient is to use Threshold tool in PS..... Cheers,  John

Fay

Slapped wrist from Rick there Mike.

Fay
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Fay

It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Rick

Quote from: Fay on Oct 11, 2007, 19:18:39
Slapped wrist from Rick there Mike.
Mike is a moderator in some sections... just not this one (at the moment) ;)

Fay

It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Miriam

I'm just joining in this conversation to see if I have managed to get a personal picture on the forum (although maybe I should have used the first picture I took of the moon.)

I'll have to try to get my webcam sorted to bring to Paul's on Saturday  - so much to learn . . . .