I know it may not affect many players, but, now they are stored (generated?) as .jpg, making it very unreadable if some ISP (Internet Service Providers) turn on forcefully to big .jpg image reduction (yeah, some ISPs in some countries are so "Brilant". They told me on forum I can phone and bug them to give me other APN ( Access Point Name).
Making this would save my nerves to phone for get new APN, and also my eyes when I read captcha images. There is add-on to FireFox, to turn this off, but it not always work, also I use Chrome, and it forces me to set proxy on my PC, and I hate to use and configure freware proxies to make them work. Lol. And yes - I am not trying to beat captcha to write bot or script to re-read them if someone things that making them as .png would make it easier ; ]
I really beg for it 
I click links back when I am on-line 
This player is Godlike!
Never mind. I found add-on to chrome which does the same as on FF. XD. But it can help others in future. LoL.
I click links back when I am on-line This player is Godlike!
Actually images in .jpg are scaled down, and while they are still readable for human eyes, I can read about ten of them from long distance, but after 20 of such captchas eyes tend bit to hurt, so I started to use this plugin to Chrome - it changes header request of http pages to make override of ISP cache. Like : Pragma = no-cache, for white listed page: http://www.futurerp.net/pages/captcha_secure.php . And it seems to work.
When I turned it on to all domains like whitelist: .*://.* pages starts to load much slower, as they not compres html source and all other images (I think that metod they use for html is wort a penny, but for quality loss scaling of .jpg images it sometime makes problems like they make such captchas less readable).
If someone does not know how to set such plugins in any browser and have similar issue can always hit Shift + Ctrl + R on page, but I think that plugins make life easier in that case. And I am aware you worry about bot makers, and that .jpg is harder to decode.
I click links back when I am on-line This player is Godlike!
Edited 1 time(s). Last edited by KVZ @ Mon Apr 30 14:55:11 EDT 2012
Quote from KVZ
Actually images in .jpg are scaled down, and while they are still readable for human eyes, I can read about ten of them from long distance, but after 20 of such captchas eyes tend bit to hurt, so I started to use this plugin to Chrome - it changes header request of http pages to make override of ISP cache. Like : Pragma = no-cache, for white listed page: http://www.futurerp.net/pages/captcha_secure.php . And it seems to work.
When I turned it on to all domains like whitelist: .*://.* pages starts to load much slower, as they not compres html source and all other images (I think that metod they use for html is wort a penny, but for quality loss scaling of .jpg images it sometime makes problems like they make such captchas less readable).
If someone does not know how to set such plugins in any browser and have similar issue can always hit Shift + Ctrl + R on page, but I think that plugins make life easier in that case. And I am aware you worry about bot makers, and that .jpg is harder to decode.
The CAPTCHA image is supposed to send headers telling the browser/proxy caches not to cache it. I'll check. 
EDIT: Well, I've checked the headers on the image, and they seem to be correct. I did add "private" to the cache control header though, so it might be worth checking to see if that fixes it for you.
I know you have a workaround now, so it doesn't matter either way, but it would be interesting to see if this fixed it 
Invisible War ][
Edited 1 time(s). Last edited by Cyberkilla @ Mon Apr 30 15:17:49 EDT 2012
Hm, quite possible that ISP overides such server side arguments in page headers, because when I turn my browser plugin off, images are still downscaled on captcha page. Also I am now not sure how to properly whitelist page in this plugin as it once works and not always (when I turn it to all pages - browsing experience is slowed down).
Edit:
I white lised it as http://*captcha_secure* and it seems to work, but I wonder when it not worked with whole link adres as white list. Weird.
I click links back when I am on-line This player is Godlike!
Edited 1 time(s). Last edited by KVZ @ Mon Apr 30 15:53:12 EDT 2012