Re: superimpose image

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Author: Brian Cluff
Date:  
To: Main PLUG discussion list
Subject: Re: superimpose image
While you can use software to fake it, it doesn't give you the same
quality as you would get from 3 separate images shot at different F Stops.
The biggest difference you will see when using a single image is that
the darker parts of your fake HDR image will be very grainy/noisy and
there will also be some noise that spills over to the rest of the image.

You can do a lot better if your single image is a RAW image with it's
higher bit-depth instead of it's JPEG equivalent, but even then, without
the longer exposure time that you would get from using a larger F-stop
the data simply isn't there is be able to expand for HDR (really
tonemaped) images.

Brian Cluff

On 01/11/2016 09:48 AM, Michael Havens wrote:
> I was wondering... would using software to over/under expose an image
> be the same as taking 3 images which have been physically altered?
> Less wear and tear on the camera is good!
>
> Also, I was watching a tutorial on luminance hdr and in his version
> the software had a bunch of variation of an hdr which could be
> modified. My version doesn't seem to have that. Is there a setting?
>
> On Thu, Jan 7, 2016 at 9:58 PM, Brian Cluff <
> <mailto:brian@snaptek.com>> wrote:
>
>     Use LuminanceHDR for exposure blending.  GIMP is waaaaaay too much
>     work to get just one way to blending the images. Luminance on the
>     other hard offers a tons of different methods and then you can
>     tweak the settings within each method.  It's all very easy and
>     gives you much better results.

>
>     Brian Cluff

>
>     On 01/07/2016 05:51 PM, Michael Havens wrote:

>
>         thank you so much man. I really appreciate it. I certaainly
>         will devote
>         10% of my available   brain to these videos tomorrow. Do you
>         know of any
>         videos or text teaching how to do exposure blending with
>         gimp2.8? all
>         the tuts  I've been finding are incomplete or are how to do it
>         with 2.2!

>
>         On Thu, Jan 7, 2016 at 7:37 PM, Brian Cluff <
>         <mailto:brian@snaptek.com>
>         <mailto:brian@snaptek.com <mailto:brian@snaptek.com>>> wrote:

>
>             There's a ton of ways to do what you want.  The biggest
>         thing you
>             will have to worry about is lighting.  For instance, if
>         you are
>             putting something that was lit from the left into a scene
>         that was
>             lit from the right, then there is little you can do. No
>         matter how
>             carefully you add it to your scene your brain will always
>         tell you
>             there is something wrong with the picture.

>
>             I tend to use a couple of different techniques to put one
>         image into
>             another.
>             If the background is a relatively solid color, I'll use a
>         technique
>             similar to this example for cutting out images while
>         preserving fine
>             details (hair in this example)... hint, you don't use ANY
>         of the
>             selection tools, or copy and past.
>         https://www.youtube.com/watch?v=AnbxtMCHKV0
>             or
>         https://www.youtube.com/watch?v=Jle81ofRLok
>             or
>         https://www.youtube.com/watch?v=quAChCnK_Dk

>
>             The other way I like combine image is brushing out the
>         background
>             using layer masks as demonstrated in this video with the leg:
>         https://www.youtube.com/watch?v=hHJAJziWDs0

>
>             I usually use a combination of the 2 techniques since you
>         rarely get
>             perfect results with either method.

>
>             All these methods ultimately use layer masks, which is a
>         much better
>             way to combine photos than cutting and pasting since you
>         can tweak
>             what is transparent or not back and both without having to
>         commit to
>             a certain part of an image like you do with cutting and
>         pasting.

>
>             Brian Cluff

>
>
>             On 01/07/2016 02:58 PM, Michael Havens wrote:

>
>                 I found a way to super impose an image but it looks tacky.
>                 The method I learned was to open both files and then
>             to select the
>                 image you want to put on the other with fuzzytool. I
>             found that
>                 didn't work so I used the path tool. Well I cut the
>             image out but
>                 the paste doesn't look good. It is out of scale. For
>             the purposes
>                 I need WHat ithe best way to cut a house out and put
>             it on a blue sky?

>
>                 --
>                 :-)~MIKE~(-:

>
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