[ptx] Image resolution of stitched images

[Philipp B. Koch]

Thank you! Actually the panorama has been printed too big (21 cm of 
height instead of 16) in comparison to the maximum output size of the 
original pictures, so of course that's the reason for the distorsion. I 
was just confused with this resolution measures. Thank you for information!

Philipp

PS. As I am only a user (and not a programmer), is there a place (maybe 
this mailing list?) where I could make suggestions for possible 
improvement of Hugin's user friendlyness? Perhaps it could help to 
spread the variety of possibilities how things can be handled with Hugin?



Carl von Einem schrieb:

> Hugin doesn't degrade resolution as you might think, Image resolution 
> is only a relation (DPI: Dots per Inch) and is neccessary to show the 
> size you will get on your output medium.
>
> In Photoshop's menu Bild: Bildgrösse... (menu Image: Image size) just 
> deselect "Bild neu berechnen mit" (= Interpolator drop down menu) and 
> choose the dpi number you need for your output device (printer ~300 
> dpi / screen 72 or 96 dpi, etc.). You will see that the actual amount 
> of pixels won't change whatever dpi number you type.
>
> The resulting size of your pano depends on the FoV of your camera's 
> lens: a shorter focal length (e.g. 28 mm instead of 35 mm) leads to a 
> smaller number of pictures you will need for a panorama but also gives 
> you less pixels per degree.
>
> So if your print @ 300 dpi doesn't show a big enough pano you have to 
> either shoot your pano with less FoV per picture (35 instead of 28 mm) 
> or choose a camera with even more MP.
>
> Does that help?
>
> Carl
> (Munich, also Germany)
>
> Philipp B. Koch wrote:
>
>> I have a question about the image resolution of images being stitched 
>> with Hugin. Since I haven't found this topic in the mailing list 
>> subjects, I hope it has not already been dealt with.
>>
>> My source images (made with Nikon Coolpix 5400) are 2592 x 1944 
>> pixels (= 5 MP) of size and their resolution is 300 pixels/inch when 
>> being opened in Photoshop. After stitching them together with Hugin, 
>> image size (both pixel measures and printing size) is pretty huge 
>> while resolution is only 72 pixels/inch. For example: The original 
>> image printing height (source images) shown in Photoshop would be 
>> 16,46 cm at 300 pixels/inch -- the stitched images have a height of 
>> 71,12 cm at 72 pixels/inch. This is a problem because printing them 
>> shows bad results (ugly small squares in the image caused by low 
>> resolution). First I thought, this might be caused by Enblend, but 
>> already the result images (flatened TIFF using PTStitcher, no 
>> color/brightness correction) generated by Hugin are like that.
>>
>> How can I avoid Hugin from setting down image resolution? What am I 
>> doing wrong?
>>
>> Thanks, Ph.Koch (Berlin, Germany)
>>
>> ___________
>> I'm using: Hugin 0.5 beta3 on Windows XP Prof; Autopano 1.30 (A. 
>> Jenny); Enblend GUI 1.0 (E. Boyd); Photoshop 7
>
>
>