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Posted by Anirudh Dutt on 03/01/05 12:36
i just opened 4 jpg files...dunno about where the header is...coz i
didn't find anything common at the begining of the files (so i doesn't
seem to have a header at the "head").
i found (only) one jpg which had JFIF as the 7th to 10th bytes.
i did notice that the _last 2 bytes_ are FF D9 in *all* 5 jpg's. that
should be a good way to check depending on how the jpeg's in question
differ from the real thing.
fopen image; fseek ( $handle, -2 , SEEK_END);
$last_2_bytes = fread ($handle, 2 [bytes]);
if ($last_2_bytes == 0xffd9), perhaps an ok jpg.
have u done anything to the images? are they photos, scanned, gaphics
(from photoshop/gimp)?
On Tue, 1 Mar 2005 09:44:08 +0000, AdamT <adwulf@gmail.com> wrote:
> I've had similar problems to that.
>
> I usually either open the image with notepad, or some Hex Editor, and
> see what the bits are in the file header (eg BM for Bitmap, Gif89a for
> GIFs, JFIF for JPEGs...)
--
]#
Anirudh Dutt
....pilot of the storm who leaves no trace
like thoughts inside a dream
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