I've now got my still in Photoshop, how do I get rid of the ugly interlace lines in it?

Once you have exported an image out of CineStream and loaded it into Photoshop (or some other image processing application), you will note that the image might have some horrizontal lines distorting the picture a bit. This is due to the nature of how a TV image is made up, a thing called interlace.

Interlace a description:

A TV image is generated not in full frames, but in fields, ...two fields make one full frame (basically the TV set scans every odd numbered line in the phosphor of the screen, then quickly does another scan down doing every even line, ...the glow in the phosphor lasts long enough for the eye not to notice, so we percieve full frames (NTSC is 30 frames per second or 60 fields per second and PAL is 25 frames per second or 50 fields per second). Anyway, when you exported that still from your CineStream DV video you effectively only got one field, ...in other words not the whole 2 fields needed to make up the full frame, ..this is why you have the horizontal "interlace" banding.

How to fix it and generally make things look a bit better:

Okay we have the image, but we want to clean it up due to the interlaced nature of the still (i.e. the scanlines through it), so:

• In Photoshop, select Deinterlace, under Video in the Filters Menu.
• It should be set for EVEN fields and INTERPOLATION. This will give you a nicer end product.
• If you are going to use the still for printing, it would pay to use Photoshop to bump the image resolution up to something higher than the 72dpi screen resolution of DV (between 150dpi to 300dpi is the general ballpark area, but that depends on the output).

 

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