Re: [gentoo-user] merging or fitting images together

[Michael Mol]

On Sun, May 20, 2012 at 8:33 PM, Philip Webb <purslow@××××××××.net> wrote:
> 120520 Michael Mol wrote:
>> as Philip later remarked, it turns out the lens was likely a 75mm prime
>
> The picture of the camera looks exactly what I remember,
> tho' there might have been different models with different lenses.
> It was a very good camera for its time.

I'll say! Based on that pic, other things you've said, and the
information I found[1], that's an Ikonta 521 B with a Tessar f/3.5
lens, which appears to have been a high-end lens. Meanwhile, all of
the lenses for that camera appear to have been 75mm; the big
difference appears to be f-stop, which has an impact on
depth-of-field/bokeh. And an f/3.5 lens isn't something your modern
DSLR's kit lens can usually do.

[1] http://camerapedia.wikia.com/wiki/Zeiss_Ikon_Ikonta

>
>> The leftmost portion will never look all that great,
>> as he captured the Sun setting behind a building
>> or maybe that's a water spot
>
> The Sun was indeed setting to the left at that time + date,
> but the bluish blemish is some sort of physical decay in the negative,
> which was stored in a cardboard box for  c 55 yr  without being touched.
>
>> If these source JPG files are scans of paper photos
>
> No, they're  2  overlapping scans of the same negative,
> whose size is  58 x 43 mm  =  2,3 x 1,7 inch .

Ah. Well, the same holds true; a higher-resolution scan of the source
image, stored in an HDR image format (such as 16-bit-per-channel TIFF,
16-bit-per-channel PNG, or OpenEXR) would ultimately give better
results. Any of the 16-bit-per-channel formats would increase the
available dynamic range (of the format, at least) by a factor of 16,
at least. (IIRC, JPEG models luminance in 12 bits, and, for monochrome
images, that's at least somewhat advantageous over 8-bit-per-channel
grayscale or RGB formats.)

>
>> Anyway, the final Hugin pto file is here: http://pastebin.com/gudxvAEa
>
> What is a 'pto' file ? -- I downloaded it & it's text.

It's a Hugin project file; you can load that file with Hugin. It
assumes the two source JPEG files are in the same directory.

>
>> And the final stitch is here:
>> http://img407.imageshack.us/img407/2030/brum3068brum30702.jpg
>
> All Firefox gives me is a black window : can you check ?

Works on my system. It comes up all-black in geeqie, though; I had to
load it in Chrome. Also loads fine in Gimp 2.6.

-- 
:wq