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View Full Version : what dpi should i use for composites into dvx footage?



markcheng
10-27-2006, 12:15 PM
so dvx footage has the resolution of 720x480. if I want to create photoshop images to be composited into, or used as backgrounds in dvx footage, what dpi should i use in photoshop? the norm for web graphics is 72, and for print is 300. what do you guys recommend???

mc

mikkowilson
10-27-2006, 12:31 PM
DPI is a printing setting. It has no use as a measure in the video world.

Basically there's a releationship of: DPI x Inches = Dots (pixels)

A 2 inch wide image at 300dpi will be 600pixels wide. But this doen't matter for video. A 1 inch image at 600dpi will also be 600pixels wide.

You want to create an image that is 720x480 to work with the DVX so it matches by resolution.
If you where to print the image at 720dpi then it would be one inch wide and if you printed it 10 inches wide, it woudl be 72dpi. But it doens't matter - it would always be 720x480.

DPI has no effect on image pixel dimentions, it only referes to how bix each pixel is when printed. And therefor DPI is irrelevant in the video (digital) world.

- Mikko

markcheng
10-27-2006, 01:09 PM
does a dot in dpi equal a pixel?

dvx footage at 24p advanced is .9 pixel aspect ratio so I would have to make that adjustment in photoshop. correct?

Adam E
10-28-2006, 05:40 PM
there is a dv setting on the canvas size. i always make my graphics on an hd canvas, and at 300 dpi or more in case i care to expand them later. some people might say that is overkill or unnecessary, but the results look nice. take that for what ever it might be worth to you.

-adam

SomewhereinLA
10-28-2006, 05:49 PM
Video is always at 72 dpi

iceblueorbitz
10-29-2006, 01:52 PM
no dpi is completely irrelevant in the video world. web graphics isn't 72dpi because if its on the web, it has no dpi. it just has a pixel resolution. anything viewed on a monitor is just pixels. pixels per inch refers to how many of the digital pixels on your monitor will be printed (as a dot) in one inch of paper. you could make it be 720x480 pixels at 72 dpi, and it would be the exact same as if you put 7200 dpi. dpi is a print setting. so a 600x600 pixel document at 10 dpi will print 60x60 inches, as 10 pixels will occupy every 1 inch wide (one direction, not a square inch) so a 600x600 pixel document set to 100 dpi will print only 6 inches as it will cram more (100) of the same pixels into that inch. but since video is shown on a screen and not on paper, it doesnt matter what the dpi is. if you are having aspect ratio problems, which it shouldn't, you just need to set the properties on the photoshopped image (in your editing program) to "conform to aspect ratio" and it will make it fit correctly.

PaPa
11-14-2006, 04:46 PM
hmm, i wouldnt mind giving a stab at doing composites. neat info.