Pixel aspect ratio calculator professional#

Let's now compare this with the photograph: Lets' turn this to square pixels (we don't want to round it yet) The destination in this case is 720x576 59/54 PAR. Let's take the case of a 4928x3264 photograph that we want to format for 4:3 PAL DVD.įirst, determine if the image - when scaled proportionately - will be wider or taller than the destination. It is necessary or advantageous to crop or pad the source image when converting to from square pixels. Well, almost perfectly in the case of PAL… but 702.9 is more than close enough to 704 to call it 704x576.

Pixel aspect ratio calculator professional#

(Note: Some older professional NTSC formats may use 720x486. When converting to square pixels from such sources, it is usually best to crop 8 pixels off of each side and start with a 704x480 box. This how it is possible, for example, for 720x480 and 704x480 to have the same height and pixel aspect ratio. In cases where a video is 720 pixels wide (like all DV and DVD formats), the actual 4:3 or 16:9 area is only 704 pixels wide. Our example of 1048 will work fine for both. For YUY2, it must be evenly divisible by 2, while YV12 requires mod4. Setting a decimal width is impossible - and setting an odd width such as 1049 will cause problems in YUY2 and YV12 colorspaces. Just because a particular PAR conversion is 'correct', however, it does not always mean it is the best choice. To convert a non-square pixel image into square pixels without cropping, multiply its width by the PAR. Please remember that, unless your source comes directly from a DVD or some known standard format, these are only 'educated guesses', but educated guesses can often be better than stabbing in the dark.įor each resolution there are two possible PAR values listed: The 'normal' (4:3) aspect, and 'widescreen' (16:9)Ĭommon non-square pixel formats and their Pixel Aspect Ratio (PAR) In addition to common DVD formats, I have also included SVCD and a few oddball 'internet' resolutions with decent guesses as to their possible PAR.

If your image is not of the dimensions listed below, it is most likely square pixels (PAR = 1) and requires no special consideration. If you don't know where your clip originated, determining PAR can be difficult.įortunately, only certain dimensions tend to have non-square pixels and most sources of these sizes tend to follow one of the standards.

If your source looks stretched or squeezed horizontally (objects look too fat or too skinny) then it most likely it has non-square pixels. When scaling video to another size, it is essential to determine the pixel aspect ratio (PAR) of the source in order to do it properly. This is a replacement for this discussion which was so zany and nonsensical.