Archived from groups: rec.video.desktop (
More info?)
Bobby wrote:
> I wish to scan some slides, photos, negatives (Epson 1640 SU) to
> use in a video/DVD that I want to make. I'm unsure of the process
> and details eg dpi (?96), PAL resolution (?768x576?, resizing?
> file type (JPEG?). Any pointers, sugestions, help much appreciated.
720x576 PAL DVDs:
Scan / frame / crop at 788x576 (square pixels), then resample (in
only the horizontal direction) to 720x576.
704x576 PAL DVDs:
Scan / frame / crop at 770x576 (square pixels), then resample (in
only the horizontal direction) to 704x576.
* * *
If you want to crop/resize directly from a larger image to the
625/50 DV pixel aspect ratio and the standard DVD frame sizes,
you could also use the following methods:
720x576 PAL DVDs, height-based method:
1) Use a bounding box crop tool (or similar) to mark up your
desired source frame height from the original scanned image
2) The desired width (in square pixels) is 720/576 * 128/117 =
160/117 of the desired height (in square pixels). For example,
if your desired source frame height (the height of the rectangle
you want to crop from the original scanned image) was 663 pixels,
the width of the rectangle should be 160/117 * 663 = 906.666...
=~ 907 pixels, so in this sample case you would crop a 907x663
pixel frame out of the original scanned image.
3) Resample the image directly to the target resolution; 720x576.
(While resizing, make sure that the graphics app does _not_ try
to lock the height and width values of the image together.)
720x576 PAL DVDs, width-based method:
1) Use a bounding box crop tool (or similar) to mark up your
desired source frame width from the original scanned image.
2) The desired height (in square pixels) is 576/720 * 117/128 =
117/160 of the desired width (in square pixels). For example,
if your desired source frame width was 800 pixels, the height
of the rectangle should become 117/160 * 800 = 585 pixels. In
other words, in our sample case, you need to crop out a
800x585 pixel frame out of the original scanned image.
3) Resample the image directly to the target resolution; 720x576.
(While resizing, make sure that the graphics app does _not_ try
to lock the height and width values of the image together.)
It works in a similar way for the 704x576 target resolution, but
the factors are different (since the digital active picture area
is of a different shape, too):
- 704x576 PAL DVDs, height-based method: multiply the desired
source image height by 1408/1053 (= 704x576 * 128/117) to get
the corresponding width, then crop and resample to 704x576.
- 704x576 PAL DVDs, width-based method: multiply the desired
source image width by 1053/1408 (= 576x704 * 117/128) to get
the corresponding height, then crop and resample to 704x576.
For more information, see
<http://www.iki.fi/znark/video/conversion/#conversion_table>
--
znark
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