PHWinfo - Afficher un message - Adding extra images with different focal lengths to a panorama

24/02/2008, 00h31

>> My idea is that the 50mm images will need to be reduced in size to 17/50
>> (ie 0.34) to fit correctly into the panorama. The 35mm images would be
>> reduced to 17/35 (ie about half) to fit into the panorama etc etc.
>>
>> Not too sure what to do to ensure a consistency in printable resolution
>> by mixing images (of differing focal lengths) in this way.
>
> The focal length is not an issue - what matters is that you took the
> images from the same location. You are correct about the change in image
> size.
>
> One consequence of this is that you will need to double (or triple) up in
> the vertical direction to match the field of view of your original pano,
> and there will be keystoning issues because the vertical axis has changed.
> To deal with that, you could get by with the transform tool, but a tool
> such as PTGUI might save you a lot of time, since it known how to align
> images in spite of this rectilinear distortion.
>
> Another issue that you will almost certainly need to deal with will be
> color matching the sky and other objects in the panorama. One way to do
> this is with curves, and numeric values from the info palette. Again, a
> panorama savvy program may save you some effort here, though you can do
> this perfectly well manually with a little effort.
> --
> Mike Russell - www.curvemeister.com
>

Thanks Mike
I actually used PTGUI (for the first time) to create the pano. I will now
look further into it's other capabilities.
As an aside, I also created an equivalent pano using CS3's Photomerge and
found some interesting differences in image and file sizes etc, as noted
below.
PTGUI produced an image size of 3490 x 1147 pixels @ 72 ppi and a saved
filesize of 4880 KB although in CS3 the doc size and pixel dimensions are
shown as 11.5MB.
CS3's Photomerge produced an image size of 12681 x 4253 pixels @ 72ppi and a
saved filesize of only 1400KB. CS3 indicates a doc size and pixel dims of
154.3MB. The image is about 3.6 times larger but the file is about 3.5 times
smaller???
I will need to investigate further to sort these figure differences out.
In CS3 when I zoom to fill window to view them both at the same screen size
I notice that PTGUI zoom is 26.25% and CS3's is only 7.22%. I also need to
zoom in around 300% for the PTGUI pano to obtain the same size as the 100%
CS3 zoom. The PTGUI pano pixelates a loot sooner than the CS3 pano. My
leaning is therefore towards the CS3 pano because of this. But it may just
be a setting in PTGUI that will resolve this issue.
I presume with the extra images I want to insert into the pano, I will need
to maintain the same pixel resolution (or better) as that of the pano?
regards
Benny

24/02/2008, 00h31	#5
Benny Messages: n/a Hébergeur:	Re: Adding extra images with different focal lengths to a panorama >> My idea is that the 50mm images will need to be reduced in size to 17/50 >> (ie 0.34) to fit correctly into the panorama. The 35mm images would be >> reduced to 17/35 (ie about half) to fit into the panorama etc etc. >> >> Not too sure what to do to ensure a consistency in printable resolution >> by mixing images (of differing focal lengths) in this way. > > The focal length is not an issue - what matters is that you took the > images from the same location. You are correct about the change in image > size. > > One consequence of this is that you will need to double (or triple) up in > the vertical direction to match the field of view of your original pano, > and there will be keystoning issues because the vertical axis has changed. > To deal with that, you could get by with the transform tool, but a tool > such as PTGUI might save you a lot of time, since it known how to align > images in spite of this rectilinear distortion. > > Another issue that you will almost certainly need to deal with will be > color matching the sky and other objects in the panorama. One way to do > this is with curves, and numeric values from the info palette. Again, a > panorama savvy program may save you some effort here, though you can do > this perfectly well manually with a little effort. > -- > Mike Russell - www.curvemeister.com > Thanks Mike I actually used PTGUI (for the first time) to create the pano. I will now look further into it's other capabilities. As an aside, I also created an equivalent pano using CS3's Photomerge and found some interesting differences in image and file sizes etc, as noted below. PTGUI produced an image size of 3490 x 1147 pixels @ 72 ppi and a saved filesize of 4880 KB although in CS3 the doc size and pixel dimensions are shown as 11.5MB. CS3's Photomerge produced an image size of 12681 x 4253 pixels @ 72ppi and a saved filesize of only 1400KB. CS3 indicates a doc size and pixel dims of 154.3MB. The image is about 3.6 times larger but the file is about 3.5 times smaller??? I will need to investigate further to sort these figure differences out. In CS3 when I zoom to fill window to view them both at the same screen size I notice that PTGUI zoom is 26.25% and CS3's is only 7.22%. I also need to zoom in around 300% for the PTGUI pano to obtain the same size as the 100% CS3 zoom. The PTGUI pano pixelates a loot sooner than the CS3 pano. My leaning is therefore towards the CS3 pano because of this. But it may just be a setting in PTGUI that will resolve this issue. I presume with the extra images I want to insert into the pano, I will need to maintain the same pixel resolution (or better) as that of the pano? regards Benny