10 May 2018, 02:31 | #1 |
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Uploaded PNG images are converted into JPEG now.
Is the forced image conversion from PNG into JPEG a new feature or a bug?
Some details are getting lost and JPEG artefacts are added. Not good if you want to explain or demonstrate small differences between two screenshots pixel by pixel. |
10 May 2018, 14:52 | #2 |
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I uploaded a PNG screenshot and clicked on "Preview Post". Then on the attached PNG and it looks good. If there is a bug that converts PNG to JPG then it should be fixed. Investigation needed.
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10 May 2018, 17:20 | #3 |
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Today I noticed that it depends on the size of the uploaded image file. If a PNG is greater than 488.3 kB than it's converted into a JPEG and the extension changes, too. Don't know if that limit has already existed on the old server. I think that the free upload volume should be the only restriction. Maybe a requester could ask the user whether he wants to convert his images into the smaller JPEG format. If not, then the users sometimes has to cleanup his uploads.
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10 May 2018, 17:41 | #5 |
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Thanks DamienD !
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10 May 2018, 20:29 | #7 |
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Thanks Mark,
usually I'm already using the highest PNG comression rate = 9 in IrfanView, but I just saw that it has also support for a PNGOUT plugin, although I won't expect more than a few percent size reduction. The PNGOUT plugin is only as a 32 bit version available, but I'm using IrfanView 64. Last edited by PeterK; 10 May 2018 at 20:39. |
10 May 2018, 20:37 | #8 |
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Sometimes you'd be surprised how much an improvement you can get, especially for images that have a limited palette.
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11 May 2018, 01:00 | #9 |
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With PNGGauntlet (PNGOUT included and updated) it takes very long to optimize some screenshots from WinUAE: 3-4.5 minutes. Ok, the size reduction looks quite good, up to 30 % less, but I can get 22-25 % already with IrfanView in less than a second, and then PNGOUT would only give me another 3.5-4.5 % better compression. I would do that only if size is a very important factor.
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11 May 2018, 10:44 | #10 | |
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Quote:
I have raised up the size limit to 1MB for jpg / gif / png instead of 500k |
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11 May 2018, 14:28 | #12 |
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11 May 2018, 16:12 | #13 | |
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Thank you RCK, now it's 100 % better than before! Btw, with IE11 I still get these doubled line feeds in the editor, and I cannot click on smilies to insert them into the text. Only drag&drop works. |
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11 May 2018, 16:14 | #14 |
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IMHO automatic format conversion is not good. If the image size is to large then a message should inform the user about it like it is done with other filetypes.
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11 May 2018, 16:17 | #15 |
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12 May 2018, 19:18 | #16 | |
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Quote:
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12 May 2018, 19:38 | #17 |
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Hmm, I guess your optimizations are so much faster, because your small images will fit completely into the CPU cache unlike my 1280x800 screenshots. I have only a slow Mini-PC with 2x1MB cache.
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12 May 2018, 20:22 | #18 |
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I tried compress 34 files in 1280x800 and it took longer (2 mins, 6 secs). I will use it mostly for 320x256 images, so no problem for me.
RCK should consider using PNGOUT for HOL. I did some tests and the size can be reduced 20%-40%. Last edited by hipoonios; 12 May 2018 at 20:29. |
12 May 2018, 20:33 | #19 |
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Well, I see, your PC must be about 50 times faster than mine.
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14 May 2018, 17:09 | #20 |
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