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Graphics are much more granular for BD than with DVD For BD, graphics can be created for a full-screen menu, but graphics are also created for buttons, animation sequences (such as load icons) and highlight/selector indicators Graphics are also used for slideshows, such as photo galleries and information pages Graphics can be tricky and the traditional tools for creating computer graphics are not always well suited for video-based graphics
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Graphics should be created in 24-bit mode Choose RGB colorspace (or YUV colorspace, if available) rather than CMYK or other print-oriented colorspaces The file format should be either PSD, PNG or JPEG PNG is the basic format and it has an advantage over JPEG in that it has an alpha channel Whichever format(s) that you use is ultimately determined by your authoring system or programming framework Please be aware that JPEG compression can cause artifacts that may be compounded by MPEG compression If you must use JPEG, choose the highest quality level that is compatible for BD With Photoshop, for some odd reason, this means choosing a quality level of 6 to ensure compabitility HD video uses the ITU-R BT709 colorspace (RGB values in the 0-255 range) While any SD mode video on a disc is ITU-R BT601 colorspace (RGB values in the 15-235 range) and saturated colors, especially bright reds and yellows, will "bleed" on the display With a 1920 1080 display many, if not all, of the color issues that existed with DVD are gone The only thing to keep in mind is that there are multiple playback resolutions 1920 1080, 1440 1080, 1280 720 and 720 480 Choose and then test the resolutions that you want to support with your design It is possible to use some very small fonts with the HD resolutions These fonts may not be readable on lower resolution monitors or at the viewing distance of a user's display
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The pixel density of the image does not matter Whether you use 72 dpi or 96 dpi or 300 dpi, what matters is the final pixel dimensions of the output However, pixel geometry does matter when using SD material Most computer graphics programs use square pixels SD material on BD is based on the ITU-R BT601 format that does not use square pixels In Photoshop, choose rectangular pixels for your SD graphics For HD graphics, use square pixels (the default) and you're good The screen size for HD is 1920 1080 pixels, so it is best to work on a computer monitor that has at least this resolution so that you see an exact pixel representation with no scaling
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Most SD televisions employ overscan, which hides the edges of the picture Overscan can hide as much as ten percent of the picture Two common safe areas are used to account for this The action-safe area defines a five percent picture perimeter as the guideline for the outer boundary for action and important video content The title-safe area defines a ten percent picture perimeter as the guideline for the outer boundary for text and other vital information (see Figure 125)
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Figure 125 Video Safe Areas
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Some programs have built-in video safe templates In After Effects, for example, press the apostrophe key to turn the safe area markers on and off Most modern TVs do not have more than 5 percent overscan, but older models may approach 10 percent Computers, LCD or plasma screens, and many video projectors have little or no overscan Although, unless the display is 1920 1080, you still need to account for action and title safe areas Most often, 75% is a good allowance for action and title safe on the newer high definition displays
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