To solve the problem of distortion usually associated with panned panoramas, a method called slit lens composites can be used. Instead of panning the camera through a arc this method moves the camera alone a line parallel to the subject. To remove the problems associated with lens and perspective distortion a slit is place in front of the lens to produce a vertical slice of the subject.
This method is frequently used when producing panoramas from video files by organisation as Google Maps to produce streetview.
A slit is placed in fornt of the lens so each frame of the video produces a slice of the subject. It is placed over the centre of the lens to minimise distoration. The slit is slightly angled. The angle is determined by the speed of horizontal movement. The faster the movement the greater the angle of slit.
a slice extracted from a slit route panorama used to produce the composite below
a slit route panorama produced from video – only every 20 slices is used to produce a cubist style image
The video below was recorded on my dlsr and imported into Photoshop using the process previously described
The final panorma combined and edited in Photoshop
Instead of using multiple stills to create a panorama it is also possible to create a single panoramic image from a panned video. The benefit of this is that you are creting 25 still frames per second providing plenty of information to ensure minimum distortion and detail. You will not need all of the 25 frames you capture per second, but you will have far more than you would have captured with stills. It will also more accurately capture light graduation from one side to the other.
1. Create a 180 degree video. Ensure the video is 180 degree and the time panning left to right is even. Try not to exceed 10 seconds or will just be adding unnecessary frames.
2. In Photoshop import the video using the File -Import- Video Frames to Layers
4. Export the resulting frames from Photoshop so you can apply lens correction and white balance after importing them in Lightroom. Use File-Scripts-Export Layers to Files in Photoshop. Export as JPG with a Quality of 12
4a. Select the location for the exported JPG files
4c. Sync the changes to all the frames and export them back out
5. In Photoshop via Mini Bridge reload the updated JPGs by using Tools-Load Files into PS Layers
6. Create the Panorama using Edit-Autoalign Layers and use Spherical
6a and select the panorama style to use – for 180 degree pans select Spherical
7. One the layers have been aligned select Edit-AutoBlend Layers and when the dialogue box appears select Panorama.
Flatten the layers correct any alignment and colour issues.
An example of a panorama created from a 10sec handheld video. The perspective and convergence could be improved by using a tripod
To create a video slideshow of your images take collection of still still image files and suitable music and place them in a directory on your computer.
Using a video editing tool such as Adobe Premiere Pro insert the still files onto the video timeline. You can adjust the period of time each slide appears on the timeline to suit the style of video you wish to produce.
Transitions between each still image can be used to provide a mood for the video presentation.
Audio files can be inserted into the video timeline to provide sound effects for each slide or background music.
The file can then be output into a suitable format such as Avi and uploaded to a suitable medium for distribution such as Facebook ot YouTube.
One of the issues with photography large image is trying capture them in a single output. This can be acheived by taking multiple images and using Photoshops panorama tool, merging them to produce a single file. The technique for doing this is to place your camera on a tripod and capture a series of images ina sweeping fashion. This work well for small buildings, but in large buildings this produces a curved and distorted image as shown below. The purpose of this project is to develop a technique that produces an optically correct image with minimal distortion.
One technique used to solve the issue of shooting with bright skies is to use flash as main. This does exactly as it describes, using the flash as the main light instead of the sky or other light source. This enables you to underexposure the sky as compared to normal resulting in a deeper blue. With the flash illuminating the subject it provides a light balance as compared to normal.
The image was captured using the sky as the main light, resulting in a dark flower and light skies.
This image was taken with an exposure 2 stops below the previous with the illuminating the flower as the main light source. This results in deeper skies and less contrast between the subject and the sky