Forum:Uploading new GEMH images

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Forums: Yew Grove > Uploading new GEMH images
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This thread was archived on 26 July 2009 by Azaz129.

GEMH Images

You'll need Firefox and Greasemonkey, then you can just go to and the GEMH images will appear! ~Nightgunner5 talkTrans 20:17, 5 March 2009 (UTC)

I've begun using it, and trust me, its quite excellent! Heres a few example images: (I'm not sure you will be able so see them)
--Rollback crown.svgAburnett001 {Talk} {#} 20:25, 5 March 2009 (UTC)
Works great, nice job. - TehKittyCatTalk Wikian-Book 21:13, 5 March 2009 (UTC)

Uploading new GEMH images

I have prepared the historic images for all Exchange items. The details of the image database are as follows:

  • Data period: 1 January 2009–23 June 2009
  • Total: 3,309 items
  • Total data points: 253,334 (average ~76 points per item)

Comparison of PointyBo t's GEMH images and the current GEMH images

Compared to the GEMH images uploaded by PointyBot in 2008, the current images are slightly bigger in size and filesize.

PointyBot Current Current + trendline
Size 300x215 483x387 483x387
Filesize ~7 kB ~5kb ~8kB

Old version (PointyBot)
PointyBot's version

Current (without trendline)
File:GEMH Rune boots - no line.png

Current (with trendline)
[[File:GEMH Rune boots.png|Current (with trendline)]]


For 3,300 items, the total size would amount about 75 Mb, which is quite a lot compared to the GEMH images produced by PointyBot. If anyone knows how I could reduce the filesize of the images (using batch conversion software), please let me know. If "Indexed PNG" is used, I feel that the filesize can be reduced dramatically. However, I currently do not know how to do this en masse. I use a GIMP script to reduce the filesize from 25kb to 5kb.


I've added a trendline for the GEMH images to show the increase/decrease over the period of 5-6 months.

Vandalism and its effect on prices

Since the prices are based on the page history information, some prices might be inaccurate. Several precautions have been taken to detect vandalised prices, and they have been removed accordingly.

However, the detection and removal is a manual process, which is done by comparing two prices. A sudden jump/drop in price is detected and reported by the "bot", and I remove the prices if I feel that the prices are wrong/vandalised. As the price data are stored in an Excel file, it is easy to locate the erroneous data and remove them accordingly.

Frequency of updates

Probably, once or twice a month. The process of downloading database dumps as XML files and extracting them into an Excel database is semi-automated, and it takes a lot of processing time. As far as I know, PointyBot extracted the data straight from the server, and this could have caused lag.

  az talk   22:18, 29 June 2009 (UTC)