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Grasshopper Headstudy

 
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Sun Sep 14, 2008 7:59 am    Post subject: Grasshopper Headstudy Reply with quote

This is the eastern cousin to Charles`s Grasshopper 3D Very Happy. One question, why am I getting banding of colors in my backgrounds sometimes. The background is 15" behind the subject (just a wall).

F/5.6
ISO100
Ex .5
Canon 400D, Canon 100mm Macro, 84 images stacked with Helicon Focus


Info the same as above, stack of 43 images

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Doug Breda


Last edited by beetleman on Sun Sep 14, 2008 12:08 pm; edited 1 time in total
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 19408
Location: Richland, Washington State, USA

PostPosted: Sun Sep 14, 2008 10:43 am    Post subject: Reply with quote

Nice hopper!

I've seen banding like this with HF "Method B" ever since that method appeared. I haven't studied it very closely, but I suspect it appears when there is variation in background brightness from frame to frame. If this is strobe lit, variations in the strobe brightness from frame to frame could be responsible.

If you are using Method B, then give the older Method A a shot -- it usually does better with hairs and overlapping detail anyway.

And if this already is Method A, I'd like to know that.

--Rik
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Sun Sep 14, 2008 11:55 am    Post subject: Reply with quote

Think basicly, I just use HF right out of the box and I do not change any parameters, so, whatever it is set to by default is how I use it. Right now I am using two lamps that came with a small portable lightbox I bought at a camera store.

Thanks Rik.
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 19408
Location: Richland, Washington State, USA

PostPosted: Sun Sep 14, 2008 11:57 am    Post subject: Reply with quote

I searched the archives for any more information about the banding. One comment I found (that I had posted and then forgotten! Embarassed ) was that Method B
Quote:
created obvious banding in the background from what had previously been an unnoticed shift in background brightness from back to front of the stack

Perhaps the ambient light in the room was gradually changing as you shot your stack?

--Rik
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Mon Sep 15, 2008 2:44 am    Post subject: Reply with quote

Where do you select method A ? Thanks again Rik.
Doug

EDIT
Opps, I just upgraded to 4.5 and I can see the "Method A & B" dropdown menu showing. Will give them a test next stack.
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Cyclops



Joined: 05 Aug 2006
Posts: 2968
Location: North East of England

PostPosted: Mon Sep 15, 2008 5:42 am    Post subject: Reply with quote

Very nice shots Doug! As for banding i thought that was down to jpeg compression.
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 19408
Location: Richland, Washington State, USA

PostPosted: Mon Sep 15, 2008 7:53 am    Post subject: Reply with quote

Cyclops wrote:
As for banding i thought that was down to jpeg compression.

Could be. There are several aspects of the appearance that make me lean toward stacking artifact, but it would take some more investigation to know for sure.

Doug, be sure that HF is set to produce highest quality jpeg output. Reduce quality to meet forum size limits only as the very last step, after all cropping & resizing. That way you can compare before & after to see what got lost. Many tools, like Photoshop, will interactively show you a preview of what jpeg compression will do to your image, so you can pick an appropriate level on the fly. I generally go for the highest quality that still fits in 200 KB.

--Rik
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lauriek
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Joined: 25 Nov 2007
Posts: 2404
Location: South East UK

PostPosted: Mon Sep 15, 2008 10:26 am    Post subject: Reply with quote

Lovely shots Doug!

I think the red on the antennae contrasts really nicely with the green on the hopper, personally I might be tempted to do a slightly lower mag stack to get more antennae in the shot..
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