Broken Thumbnails?

Stratadrake · Posted: Mon Sep 13, 2004 1:42 am Post subject:

This sort of thing occurs occasionally, but only on a certain few images. Take start_fire's profile for example.

The thumbnails are completely blank. No errors or anything, and the pictures [i]themselves[/i] come in just fine, only the thumbnails fail to work.
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Stratadrake · Posted: Sun Sep 19, 2004 2:26 pm Post subject:

Second example of the elusive broken thumbnails.

Example: cat_guy111

(edit -- caused by case-sensitive links)
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Stratadrake · Posted: Wed Oct 06, 2004 11:28 am Post subject:

The third breed of the elusive, hard-to-find broken thumbnail. This one apparently contains a full error message (that's what I got after using IE's "Save Picture As" command) .

So far, both this one and the previous ("404") one seem to only occur on certain PNG files.
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cstdenis · Posted: Wed Oct 06, 2004 1:38 pm Post subject:

The answers to the 3 types of problems.

1. The image is in a format (or variation of format) that the image library I am using to resize the images (GD 2.x) can not properly handle. There is nothing I can do about it, but those submitting such images, can try saving them as a bitmap, then opening them in another program, and saving them as gif, jpeg, or png.

It also may just be an artifact of the resize algorithm not being able to handle subtle pencil shading well.

2. The thumbnails are case sensitive with usernames. cat_guy111 should actually be Cat_guy111. Use that and they will work fine. All links made by the site should use proper case usernames; just some human made ones may have this problem.

3. As the error message says, BMP is not supported. QUIT SUBMITTING BMP FILES PEOPLE. JUST RENAMING THE FILE ISN'T ENOUGH.

and AP people, keep an eye out for bmp files (you should be able to see the filename as the last info feild). They shouldn't be getting as far as you, but some seem to be slipping through the format detection process.
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Stratadrake · Posted: Wed Oct 06, 2004 4:14 pm Post subject:

#1 - So that's what it is.

#2 - My bad, then. Woe upon usernames with offbeat or sticky capitalization :rolleyes:

#3 - The image in question, apparently they [i]did[/i] save it as a JPEG (notice compression artifacts) but then it was re-saved [i]as[/i] a BMP but still with the .jpg extension -- it loads bottom-up like a BMP and is [i]600+ kb in size[/i] -- I've no idea how that happened but a few ideas:

- Netscape: Right-clicking and selecting "View Image" will switch to showing the image, and Netscape identifies the image format in its title bar. Alternatively, looking up the image under View>Page Info should identify the image's format as well.

- Internet Explorer: Right-click on the image and select "Save Picture As"; the [i]Save As Type[/i] dropdown list will reflect what format the image actually is -- if it's a bitmap, then "Bitmap" will be the only choice in the dropdown list. (Right-clicking the image and selecting "Properties" will not tell you what the actual format is)

- The first two bytes (header info) in every bitmap file I've seen read "BM", an easy way to manually detect them.
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cstdenis · Posted: Thu Oct 07, 2004 12:21 am Post subject:

[quote]- The first two bytes (header info) in every bitmap file I've seen read "BM", an easy way to manually detect them. [/quote]

Ya, but I'm using somewhat simplier detection methods. Maybe I'll have to start using somthing based on that.
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Stratadrake · Posted: Fri Oct 08, 2004 8:46 pm Post subject:

Maybe if it becomes a problem -- that last one was the sole BMP image I've seen in quite some time, the only real problem is it being so big (yup, in part because it's a BMP).

I can understand people renaming the file extension if they don't know any better . . . but that one, saved as a JPEG and then as a BMP, I can't see somebody doing that on purpose....
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