File talk:Eritrean Railway Map of March, 1998.jpg

  I have just removed a {{Duplicate}} tag from this image. I don't understand why a PNG image approximately 1/2 the pixel width in each dimension is a duplicate.

1. I understand that there should be an SVG for our use on WMF projects. Fine, that's coming. Unless someone wants to take the AutoCAD R14 DWG from me and make an SVG, it requires my setting up Gimp -- which I have intended to do for some time, but which will not happen immediately. This assumes that Gimp can properly handle the splines in the DWG. Making an SVG from one of the bit-map versions is not smart.
2. I understand that in general, PNG is a better format for maps, drawings and other images that do not have continuous tones. However, apparently Commons's software cannot correctly thumbnail png images larger than approximately 12 million pixels, hence my upload of a large JPG.
3. We need to remember that Commons is a source for images for many others than WMF and that other uses may need higher pixel counts than are in the "duplicate" PNG.
4. While this image is 10,000 pixels wide, it is only 3.5MB, so we needn't worry about taking up too much storage —Preceding unsigned comment added by Jameslwoodward (talk • contribs) 13:44, 17 May 2010 (UTC)

Okay because:

2. thumbnails (source) are not determining for quality (so JPG is sometimes better in extra sharpening) but for small size

3. the better image is here linked File:Eritrean Railway Map of March, 1998.png under Other version = [1]

4. this image is very large and rendering takes too much time and memory (for ever and everywhere and everyone). And this image has much lesser size and better quality.

references: COM:FT But I think another one (admin) should decide. --Perhelion (talk) 19:54, 17 May 2010 (UTC)(en isn't my mother tongue)

So I've maybe another suggestion, use the (small?) JPEG as thumbnail and the PNG as original. You could also compress "lossless" the original PNG (10000x4516 24bit) 408KB to 282KB (2bit) --Perhelion (talk) 20:17, 17 May 2010 (UTC) If so, then please delete all my image versions on file:Eritrean_Railway_Map_of_March,_1998.png, i've marked it with {{JPEG version of PNG}} --Perhelion (talk) 16:47, 29 May 2010 (UTC)