The Video tab controls properties of the image, as shown in Figure 6.1, “Video settings tab”.
This option is only applicable if the selected content is an existing DCP. It allows you make a VF DCP, using the video content from the existing DCP by referencing it (rather than copying). See the section called “Making overlay files”.
The next option on this tab is the ‘type’ of the video. This specifies how DCP-o-matic should interpret the video's image. 2D is the default; this just takes the video image as a standard 2D frame. The 3D left/right option tells DCP-o-matic to interpret the frame as a left-right pair, as shown in Figure 6.2, “3D left/right image type”.
Alternatively the 3D top/bottom option tells DCP-o-matic to see the frame as a top-bottom pair, as shown in Figure 6.3, “3D top/bottom image type”.
Another option is 3D alternate which takes the first frame of the content as for the left eye, the second for the right eye, the third for the left, and so on. Finally, you can specify 3D left only or 3D right only if this content contains only the the left or right eye images. This is useful when you have the left and right eye image sets in different files; you can specify one content as 3D left only and another as 3D right only and DCP-o-matic will pick up the appropriate frames from each.
The ‘filters’ settings allow you to apply various video filters to the image. These may be useful to try to improve poor-quality sources like DVDs. You can set up the filters by clicking the Edit button next to the filters entry in the setup area of the DCP-o-matic window; this opens the filters selector as shown in Figure 6.4, “Filters selector”.
After changing the filters setup, you will need to regenerate the DCP to see the effect on the cinema screen. The preview in DCP-o-matic will update itself whenever filters are changed, though of course this image is much smaller and of lower resolution than a projected image!
The Colour conversion setting specifies what colour transforms and gamma correction DCP-o-matic will use when converting the selected content into the XYZ colourspace for the DCP.
The easiest way to select the required conversion is to choose one of DCP-o-matic's presets. DCP-o-matic knows how to convert from four common colourspaces: sRGB, Rec. 601, Rec. 709 and P3. If you do not know which preset you should use, refer to the suggestions in Table 6.1, “Suggested colour conversion settings”.
Table 6.1. Suggested colour conversion settings
|sRGB||Still images in RGB, e.g. photographs|
|Rec. 601||Standard-definition content (fewer than about 1000 pixels across) including DVD rips.|
|Rec. 709||High-definition content including Blu-Ray rips.|
|P3||Content explicitly graded to P3.|
For other required colour conversions, and if you know what you are doing, you can choose Custom which will open the full colour conversion editing dialogue box:
Alternatively, choose None if your source files are already in the XYZ colour space and require no conversion.
DCP-o-matic's colour conversion processes are discussed in much more detail in a separate document colour.pdf.
The crop settings can be used to crop your content, which can be used to remove black borders from round the edges of DVD images, for example. The specified number of pixels will be trimmed from each edge, and the content image in the right of the window will be updated to show the effect of the crop.
The fade in and fade out settings can be used to apply linear fades into and out of a piece of content. Specify the time for each, clicking Set after making any changes.
The Scale to option governs the shape that DCP-o-matic will scale the content's image into. Select the aspect ratio that your content should be presented in.
At the bottom of the video tab is a short description of what will happen to your video with the current settings. In the example of Figure 6.1, “Video settings tab”, DCP-o-matic is telling you that the video file is 1920x1080 pixels and it has square pixels (a pixel aspect ratio of 1.00) hence its display aspect ratio is 1.78:1. Since the controls specify ‘16.9’ for the ratio, DCP-o-matic does not scale the image but pads it to the DCP's container ratio of 1.85:1. For a 2K DCP this is 1998x1080 pixels.
This description also gives the frame rate of the content and what will happen to it when it is played at the DCP's frame rate. See Chapter 11, Frame rates for details of DCP-o-matic's frame-rate conversion.