use-revolution Digest, Vol 14, Issue 1
frank at backtalk.com
Mon Nov 1 11:15:10 CST 2004
On Nov 1, 2004, at 5:00 PM, use-revolution-request at lists.runrev.com
> From: "MisterX" <b.xavier at internet.lu>
> Subject: RE: image size limit?
> To: "'How to use Revolution'" <use-revolution at lists.runrev.com>
> Message-ID: <20041101033545.21B1A93005C at mail.runrev.com>
> Content-Type: text/plain; charset="us-ascii"
> How about reading half the image, and assembling after you resize and
> take a
> You can read half the image or by quarters Using a loop and reading
> the file
> the "traditional" way with Open, read, close file...
> Just wondering... ;)
The JPEG format is a compressed format, with a header that may or may
not contain EXIF information and a thumbnail, followed by the
compressed data. You cannot simply open the file, read half of it, and
expect it to be half of the picture -- that's not how compression
works. You have to find the header, skip the header, and then
uncompress it as you read each byte or sequence of bytes.
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