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#pil logs for Wednesday the 22nd of May, 2013

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[23:28:02] <Pavlov> anyone have any suggestions on how to get better image resizing quality? specifically downsizing
[23:28:24] <Pavlov> i've got a jpeg source, say 240x240, and am trying to resize down to 60x60. i'm using ANTIALIAS
[23:28:32] <Pavlov> saving back out to jpeg, quality=90
[23:28:47] <Pavlov> but the result is substantially worse than if i just let the browser resize the image
[23:30:41] <wiredfool> pavlov: have you tried bicubic fitering?
[23:31:13] <wiredfool> alternately, a slight blur might be helpful as well.
[23:32:05] <Pavlov> bicubic wasn't awesome
[23:32:08] <Pavlov> let me compare though
[23:33:17] <Pavlov> bicubic just looks like lots of jpeg artifacts, even if i save it out as a png
[23:34:15] <wiredfool> what software/version are you using?
[23:34:19] <Pavlov> let me see
[23:35:48] <Pavlov> it looks like i have PIL 1.1.7 installed
[23:36:39] <Pavlov> and i think probably some fairly recent libjpeg
[23:37:02] <wiredfool> it's not 1 bit or a paletted image?
[23:37:08] <wiredfool> what platform?
[23:37:21] <Pavlov> its just a jpeg image
[23:37:28] <Pavlov> its uh
[23:37:39] <wiredfool> ok, so probably just a normal RGB
[23:38:38] <Pavlov> yeah
[23:38:42] <Pavlov> https://dl.dropboxusercontent.com/u/11413338/8bd352129eacc9de07c03b0ece8ba055.jpeg for reference
[23:41:50] <Pavlov> https://dl.dropboxusercontent.com/u/11413338/example.png has the browser resize on the left, PIL bicubic on the right
[23:42:22] <Pavlov> (the bicubi is being spit out as a png to avoid jpeg quality/etc issues)
[23:44:43] <wiredfool> are you on a retina mac?
[23:45:09] <Pavlov> yeah
[23:45:23] <Pavlov> Am I just being dumb and needing to double the size?
[23:45:26] <wiredfool> The browser is resizing at 2x
[23:46:16] <wiredfool> that's a 120x120 image in the browser
[23:47:40] <Pavlov> mm, ok let me futz with that for a bit
[23:47:48] <Pavlov> i'm much happier with that being the case :)
[23:49:02] <wiredfool> the resize looks ok to me at 120x120
[23:49:06] <Pavlov> yeah
[23:49:17] <wiredfool> it looks small at 60x60, but bad at pixel doubled 60x60
[23:50:12] <Pavlov> thanks
[23:50:25] <Pavlov> seperately, is pillow what the cool kids are using these days?
[23:51:43] <wiredfool> It's what I'm working on
[23:52:00] <wiredfool> It's got some momentum
[23:52:57] <wiredfool> but yeah, I think so