Mmscomp pixelation of graphics

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Message

Posted on Sunday, August 17, 2003 - 03:35 pm:

Just wondering if anyone has noticed whether or not mobiles tend to pixelate graphics.

I have messages that are created via mmscomp and when displayed on a mobile are pretty much, well, crap. However, when forwarded to an e-mail address, the actual image is fine.

This has happened with the following mobiles
sony ericsson t610 - 65k screen resolution
Nokia 3510i - 4k screen resolution

image type is jpeg. Average image size 8k

If anyone has some information regarding this I would be ever so thankfull.

Bryce Norwood - NowSMS Support

Posted on Thursday, September 04, 2003 - 05:10 pm:

George,

I don't know how MMSCOMP could affect this. All MMSCOMP does is take the files that you specify and package them up into a binary MMS message. A binary MMS message is basically a binary encoding of a multipart MIME message ... so MMSCOMP doesn't actually perform any conversion on the content of the file itself. All files that are passed to MMSCOMP are copied in their entirety into one of the parts of the multipart message ... without any conversion or interpretation of the data itself.

I'd suspect that there is something about the way that the JPEG data is encoded that the phones aren't understanding. Perhaps the software that is creating the JPEG is using some advanced capability.

I'd suggest you try some tests using a simple image converter (like Paintbrush built into Windows) ... convert the JPEG to GIF ... then back to JPEG ... and see if you notice anything different.

I wish I knew more about the actual JPEG format, but my knowledge is quite limited in that area ... I just know that MMSCOMP isn't doing any interpretation of the data, other than specifying the MIME type of the data in the multipart header. I guess that could be one area where MMSCOMP might have an effect. MMSCOMP encodes the MIME type based upon file extensions ... so if the file extension of the file being submitted into MMSCOMP is not ".jpg" or ".jpeg", MMSCOMP might not be encoding the MIME type correctly.

-bn

test

Posted on Tuesday, October 07, 2003 - 02:27 am:

test

Bryce Norwood - NowSMS Support

Posted on Tuesday, October 07, 2003 - 05:37 pm:

Did this test succeed or fail?