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Video Filters

If you work with screen captures taken from video—from broadcast/cable video or from videotape—two filters in the Filters, Video submenu can help solve common problems with these types of images. These filters are the De-Interlace and NTSC Colors filters, discussed in the following subsections.

De-Interlace

Most video images are created by interlacing (or interlace scanning), which is a means of drawing an image on a television screen and was invented more than 60 years ago. Interlacing scans an image on a screen by first drawing the odd-numbered lines and then drawing the even-numbered lines. When interlaced video images are captured and brought into Photoshop, the effects of interlacing are visible and look as if there are two frames visible in the same image. The De-Interlace filter removes these interlacing artifacts by deleting either the odd or even fields (see Figure 19.15).


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