https://wiki.panotools.org/api.php?action=feedcontributions&user=ErikJanVens&feedformat=atomPanoTools.org Wiki - User contributions [en]2024-03-28T17:07:42ZUser contributionsMediaWiki 1.35.3https://wiki.panotools.org/index.php?title=Panorama_formats&diff=9158Panorama formats2007-10-04T18:26:26Z<p>ErikJanVens: typo corrected: rectlinear = rectilinear</p>
<hr />
<div>The format of a panorama is defined in broad terms by the [[Projections|projection]] used to map the full or partial 3D scene onto a 2 dimensional print or screen. There are several types of projections in use:<br />
<br />
=== Full Spherical Formats ===<br />
There are two main spherical formats: [[Equirectangular]] and [[Cubic Projection|Cubic]]. Both are able to display the whole sphere that surrounds us - 360° along the horizon, 90° up and 90° down. Specialized [[Panorama Viewers|viewers]] are needed to view spherical panoramas.<br />
<br />
[[Image:Equirectangular.JPG|thumb|250px|equirectangular panorama format]]<br />
==== Equirectangular ====<br />
The equirectangular format is widely used by a couple of [[Panorama Viewers]] as for example [[PTViewer]] and [[SPi-V]]. It consists of a single image with an [[Aspect Ratio|aspect ratio]] of 2:1 (that is, the width must be exactly twice the height).<br />
{{clr}}<br />
<br />
[[Image:Cubic.jpg|thumb|250px|cubic panorama format]]<br />
==== Cubic ====<br />
The [[Cubic Projection|cubic]] format uses 6 cube faces to fill the whole sphere around us. The image is remapped to the cubefaces which fit seamlessly. <br />
<br />
One very wide spread cubic format is [[Quicktime|QuickTime]] VR. It consists of one file containing the 6 faces as [[JPEG]] compressed images together with a header giving basic information how the panorama should be displayed.<br />
<br />
Another cubic format is used by [[SPi-V]]. It consists of the 6 cubefaces in a single row or column. [[SPi-V]] treats any image with an [[Aspect Ratio|aspect ratio]] of exactly 6:1 as a cubic spherical panorama.<br />
{{clr}}<br />
<br />
[[Image:little_planet.jpg|thumb|250px|Little planet remapping example &copy; Erik Krause]]<br />
==== "Little Planet" ====<br />
This is an unusal format that remaps a full sphere such that the ground looks like if it was a little planet. See [[Unusual remappings#Little planet|Unusual remappings]] for details.{{clr}}<br />
<br />
=== Partial Formats ===<br />
There is a number of possibilities to display partial panoramas - these are panoramas that don't fill the whole sphere in one or the other way. Partial panoramas can be displayed directly if they don't cover more than approximately 120° along the shorter side (that is they can be 360° in one direction but must be 120° or less in the other direction). The main formats are [[Cylindrical Projection|Cylindrical]] and [[Rectilinear Projection|Rectilinear]], but partial spherical panoramas are possible, too.<br />
<br />
[[Image:Cylindrical.JPG|thumb|250px|cylindrical panorama format]]<br />
==== Cylindrical ====<br />
[[Cylindrical Projection|Cylindrical]] panoramas can show a full circle along the horizon or a part of it. They are very popular for landscape panoramas. If used for architectural subjects it might bother that horizontal lines (except the horizon itself) are bend.<br />
{{clr}}<br />
<br />
[[Image:orientation-plate.jpg|thumb|250px|Arc formed panorama example &copy; Erik Krause]]<br />
==== Arc formed ==== <br />
A special type of a [[Cylindrical Projection]] where the panorama is arched like on common orientation plates. See details on [[Unusual remappings#Orientation plate (arc)|Unusual remappings]].{{clr}}<br />
<br />
[[Image:Rectlinear.JPG|thumb|250px|rectilinear panorama format]]<br />
==== Rectilinear ====<br />
[[Rectilinear Projection|Rectilinear]] panoramas display the subject just like an ordinary (non-fisheye) lens would do. The horizontal and vertical field of view are limited to about 120°. Straight lines stay straight, hence they are good for architectural subjects. But if either field of view is too large they suffer from unnatural looking distortions in the corners.<br />
{{clr}}<br />
<br />
[[Image:Equirectangular_cut.jpg|thumb|250px|cutted equirectangular panorama format]]<br />
<br />
==== Partial Spherical ====<br />
To partial spherical panoramas applies basically the same as to full sphericals (see above). In most cases they are used to cut off [[Zenith]] or [[Nadir]]. Vertical field of view has to be limited in this case to prevent the viewer from misinterpreting the source images.<br />
{{clr}}<br />
<br />
[[Category:Glossary]]</div>ErikJanVenshttps://wiki.panotools.org/index.php?title=File:Rectlinear.JPG&diff=9157File:Rectlinear.JPG2007-10-04T18:25:02Z<p>ErikJanVens: typo corrected: rectlinear = rectilinear</p>
<hr />
<div>rectilinear panorama format</div>ErikJanVenshttps://wiki.panotools.org/index.php?title=User:ErikJanVens&diff=9154User:ErikJanVens2007-10-03T12:35:18Z<p>ErikJanVens: just a start :-)</p>
<hr />
<div><math>\epsilon\rho\iota\kappa</math>-<math>\iota\alpha\nu</math><br />
<br />
:D</div>ErikJanVens