A:
Let’s say you want to print out your storyboard for a big client presentation. There will be several people in the room and you want it to look good from a distance and also upon close examination. A high quality look is important to impress the client. You created the storyboard at 72 PPI, and it looked fine on your monitor. When you printed it out, it looked awful! What happened? There weren’t enough pixels per printed dot to give you a good-looking print. You need higher resolution for print than you do for video. How do you find out how much higher?
You already know it is possible to display 256 levels of gray in RGB. Now you need to know the highest screen frequency (LPI) you should be working at, given the capabilities of your printer. To arrive at the LPI value, divide your printer DPI by 16 and multiply by 2. For example your ink-jet printer has a resolution of 1440 DPI. If you divide that by 16, 1440 ÷ 16 = 90. The rule of thumb is that you need 2 pixels per printed dot to get a nice-looking image from your printer. You will multiply 90 x 2, and set your resolution at 180 PPI. This should give you a full range of tones and a beautiful print on photo glossy paper from your ink-jet printer.
There is no LPI to worry about in video. Video defaults to 72 pixels per inch. The important thing to know is the spatial resolution—the size of the image as measured by its width and height. The screen resolution is going to default to 72 PPI for video and the Web, but you need to know the spatial resolution of your final output, in order to create your animation at the correct dimensions and aspect ratio (the ratio of width to height).
Let’s say you want to print out your storyboard for a big client presentation. There will be several people in the room and you want it to look good from a distance and also upon close examination. A high quality look is important to impress the client. You created the storyboard at 72 PPI, and it looked fine on your monitor. When you printed it out, it looked awful! What happened? There weren’t enough pixels per printed dot to give you a good-looking print. You need higher resolution for print than you do for video. How do you find out how much higher?
You already know it is possible to display 256 levels of gray in RGB. Now you need to know the highest screen frequency (LPI) you should be working at, given the capabilities of your printer. To arrive at the LPI value, divide your printer DPI by 16 and multiply by 2. For example your ink-jet printer has a resolution of 1440 DPI. If you divide that by 16, 1440 ÷ 16 = 90. The rule of thumb is that you need 2 pixels per printed dot to get a nice-looking image from your printer. You will multiply 90 x 2, and set your resolution at 180 PPI. This should give you a full range of tones and a beautiful print on photo glossy paper from your ink-jet printer.
There is no LPI to worry about in video. Video defaults to 72 pixels per inch. The important thing to know is the spatial resolution—the size of the image as measured by its width and height. The screen resolution is going to default to 72 PPI for video and the Web, but you need to know the spatial resolution of your final output, in order to create your animation at the correct dimensions and aspect ratio (the ratio of width to height).
Vocab.
LPI = lines per inch
DPI = Dots per inch
PPI = Pixels per inch
RGB = Red Green Blue
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