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High definition photo

Posted by Account Closed  
High definition photo
January 29, 2012 12:13PM
For people who do not see the pictures in the French part, I show you some examples of high-definition images. The first is a small picture of the order of 50 Mpix and the next in the order of 75 Mpix. The images are highly compressed ... but the size is right.

image 01

image 02

and 2 small images of these links

Edited 2 time(s). Last edit at 01/30/2012 04:25PM by Frédéric Hède.
avatar Re: High definition photo
January 29, 2012 02:00PM
Very impressive! Mes felicitations.

Edited 1 time(s). Last edit at 01/29/2012 02:00PM by Harjo Neutkens.
avatar Re: High definition photo
January 30, 2012 02:52AM

Excellent work! You have taken mineral photography one step further along its evolutionary path.

If I am not mistaken, you have accomplished a method that I have only thought about. I am assuming that this is a stitched together composite of numerous multi-focus stacks.

Re: High definition photo
January 30, 2012 03:23AM
Hi Gene !

That's right, it's this method.

No limitation in x,y and Z axis.

For the moment i try with my 4x objective but new test with others objectives in some days.

Re: High definition photo
January 30, 2012 06:54AM
Hm, I thought I replied to this yesterday but something must have gone wrong.
Anyway, my question has been answered already (because Gene asked the same).

Very nice results.

However, I have an additional question: do you move the camera setup or the subject? The best method would be to move the camera but with the lens staying in position - then stitching is a piece of cake. The only problem is that you have to use a lens with a large enough image circle.
I have always wanted to try that but I would need another kind of bellows for that, one with a shift option.
I guess you use an xy-stage to move either the entire set-up or the subject, right?


avatar Re: High definition photo
January 30, 2012 03:30PM
Frédéric is doing panoramic merge of sets of focus stacked images, with deep stacks in the Z-direction, and not just focus stacking, with incredible results. I have tried similar with less deep stacks, but I am limited by the resolution of my camera body, as in my not as sharp as I would like example here -

Edited 1 time(s). Last edit at 02/02/2012 11:28PM by Debbie Woolf.
Re: High definition photo
January 30, 2012 04:24PM
Hello Harry,

In my case it is the mineral that moves. For now they are testing because I have to also work depending on the capabilities of the software (Photomerge)

I use an XYZ stage with a stroke of 40 mm in all directions. The first objective is a Nikon CFI 4X achromatic. The base image has a field of view 3.5 mm. I'll try to see with others objectives. Image with this objective is 15 mm. My work is done with a bridge not a reflex.

This method is easily appliable for subjects up to 2 mm field to keep a sufficient resolution.

But this method is also applicable to larger issues and I will try quickly in this case.


Edited 1 time(s). Last edit at 02/02/2012 11:29PM by Debbie Woolf.
Re: High definition photo
January 30, 2012 08:40PM
A small try with a DCR 250, not expensive but interessant close-up.... not a very big image. First with this objective.

image with dcr 250

I think than now, all people can built great image with inexpensive material.

And the size for internet

Edited 4 time(s). Last edit at 02/02/2012 11:30PM by Debbie Woolf.
avatar Re: High definition photo
January 30, 2012 11:55PM

I believe that the defining difference between Matteo's images and Frederic's images is in the total pixel size of the final images. Of course there is no need to make 75MP images to show on a 2MP computer monitor, but those who wish to print large photos for display, or other purposes, are condemned to use huge files. Another case for super resolution images is that even on a computer monitor, you can display a non-micro image and then have the capability of zooming in to see micro details that would not be visible in the wider field of view.

For example, a 15000X5000 pixels (75MP) would make a high quality print of 50" x 17" (127cm x 42cm), A single 18MP image, from a APS-C sensor, would be approximately 5184 x 3456 pixels and would yield a high quality print of 17.2" x 11.5" (43.7cm X 29.3cm). If displayed on a monitor, there would be a difference in available zoom factor of ~3 between these file sizes. So, depending on the final result desired, bigger can be better.

The trend towards super resolution images is becoming popular in various scientific disciplines. One amateur astronomer has created an image of the sky that is 5000 MP in size and is a composite of over 37000 images! It allows one to see the whole sky and then zoom in to see very fine detail.

This is the way that science goes.... Stop long enough to see what you have done and be left in the dust. So, I admire those who push the limits. That said, I believe that both Frederic, Matteo and others are on the cutting edge. I can only aspire to refining my capabilities to these levels.

Re: High definition photo
January 31, 2012 02:30AM
What beauty! Frederic and Matteo both of you are artists!!!

Re: High definition photo
January 31, 2012 07:28PM
Hello !

Here an other example (unperfect, for the moment i see the best method). 4 image for this construction... Just DCR 250 and xyz stage

image zoomable

And small image
Re: High definition photo
January 31, 2012 10:26PM
avatar Re: High definition photo
February 01, 2012 10:18AM
Just saw your zoomable rutile Frederic, thats absolutely amazing!
Great job and thanks for sharing!
Re: High definition photo
February 01, 2012 08:40PM
avatar Re: High definition photo
February 01, 2012 09:00PM
Le Sagenite est vraiment superbe!

Edited 1 time(s). Last edit at 02/01/2012 09:00PM by Harjo Neutkens.
avatar Re: High definition photo
February 02, 2012 08:36AM
Back to topic: Frederic, if you have some spare time then goto a forum where you see experts from whom Harald was talking

If you search for "stitching" you will find some great ideas like

I wish you good luck with your phantastic work. Unfortunately my time is too limited to do the same.

Edited 1 time(s). Last edit at 02/02/2012 11:42PM by Debbie Woolf.
avatar Re: High definition photo
February 02, 2012 11:54PM
It's unfortunate this discussion went in the wrong direction !

I have edited & deleted non-relevant comments to the topic Fred started.

I'm sorry if that happens to be a post you made but I needed to bring some order into this great topic.

Re: High definition photo
February 03, 2012 07:32AM
New photo in some days i hope ;). Standard work is waiting me. I search also an objective for make photo between 4x and DCR 250....

Stage xyz could be find in ebay also.
Re: High definition photo
February 05, 2012 08:27PM
New photo for zooming..... Size is 64 Mpix. Built with 9 stacked-photo. Zoom x12, DCR 250.

Big here
Big image with zooming

small here

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