[The GIMP] Got Bored

wswartzendruber · Posted: Fri Dec 28, 2012 11:39 pm Post subject: [The GIMP] Got Bored

http://www.wswartzendruber.name/images/iphone_cm10.webp
http://www.wswartzendruber.name/images/iphone_cm10.png

BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

It's pretty. Is that what you got for Christmas?
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Old School · Posted: Sat Dec 29, 2012 12:18 am Post subject:

This is what I got
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energyman76b · Advocate Joined: 26 Mar 2003 Posts: 2022 Location: Germany

notageek · Posted: Sat Dec 29, 2012 3:20 am Post subject:

Why did the name the software gimp?
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dmitchell · Posted: Sat Dec 29, 2012 3:30 am Post subject:

gnu image manipulation program
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notageek · Posted: Sat Dec 29, 2012 3:59 am Post subject:

I'm aware what the acronym is for but did they not pay attention to what it meant?
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dmitchell · Posted: Sat Dec 29, 2012 4:09 am Post subject:

Maybe it was meant to be self-deprecating like git. Or maybe it just predates whatever slang you are thinking of.
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BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

Or maybe they just don't give a fuck. That's why you don't see "Open Source Project Help Wanted: Marketing Experts Needed" anywhere.
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notageek · Posted: Sat Dec 29, 2012 4:15 am Post subject:

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wswartzendruber · Posted: Sat Dec 29, 2012 5:42 am Post subject:

No, that's not what I got for Christmas. I've had the Galaxy Nexus for a while, and I most certainly don't own any Apple products.

petrjanda · Posted: Sat Dec 29, 2012 12:06 pm Post subject:

energyman76b · Advocate Joined: 26 Mar 2003 Posts: 2022 Location: Germany

notageek · Posted: Fri Jan 04, 2013 1:59 pm Post subject:

Hey wswartzendruber, take a look at this:

http://www.mobiletor.com/2013/01/04/spice-stellar-virtuoso-price-in-india/
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BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

notageek · Posted: Sat Jan 05, 2013 3:14 am Post subject:

Yeah but it's not going to be of any quality.
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erm67 · Posted: Sat Jan 05, 2013 1:22 pm Post subject:

Slightly related to this thread, I read that webp image compression is not bad .... not so good as jpeg2000 but good. Let's test this claim.

I took a 4000x3000 pixel jpeg from my camera,

1484551 JPEG converted to a png:

11563590 PNG (lossless)

converted to webp and jpeg2000 for comparison:

cwebp:

4036882 quality 100% webp (should be lossless)
2334216 quality 95% webp
1676676 quality 90% webp
1261198 quality 85% webp (smaller than the original JPG, probably a 95% quality)

imagemagik compress (jasper):

7526262 quality 100% jpeg2000
7526290 quality 95% jpeg2000
2939438 quality 80% jpeg2000
1778604 quality 70% jpeg2000
1440408 quality 65% jpeg2000 (smaller than the jpeg)

At naked eye there are no noticeable artifacts but it is very likely that the PSNR of the 1261198 bytes webp (85% quality) is better than the PSNR of the 1440408 bytes jpeg2000 at 65%.

webp compression is very good if compared to PNG, fast encoding and decoding, esp. compared to jpeg2000

If VP8 performs like that is really good.
Or maybe it is just that imagemagik sucks at doing jpeg2000 :-)

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Akkara · Posted: Sat Jan 05, 2013 2:32 pm Post subject:

erm67 · Posted: Sat Jan 05, 2013 3:16 pm Post subject:

BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

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pjp · Posted: Sun Jan 06, 2013 4:01 am Post subject:

erm67 · Posted: Sun Jan 06, 2013 11:25 am Post subject:

BTW webp sucks totally :-)

I did some more experiments, this time using a RAW image, (I know the lenses of the camera and the CCD disturb the picture so it is not lossless ...), and well webp uses a fixed size partition inside the image that overflows if the image is too big or quality too high. What is the rationale behind that? none probably ...... heritage of the VP8 coded from which it derives.

Well the man page says that usually a psnr in the range 20-40 is used, it turned out that using a 5640x3752 RAW it is impossible to obtain a psnr higher than 41, it keeps overflowing. With JPG2000 it is easy to obtain a psnr of 60 or higher, even with jpeg it is possible at the expense of a large size picture.

I guess it needs some reworking :-)

I want to try to compress a RAW to a psnr of 41 (the highest webp can get) using various codecs to compare the resulting sizes.

BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

They call it webp, not "profoto", probably for a reason. Maybe you're complaining that your Fiat 500 can't tow your boat.
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erm67 · Posted: Sun Jan 06, 2013 12:31 pm Post subject:

BoneKracker · Veteran Joined: 14 Mar 2006 Posts: 1480 Location: U.S.A.

Good points. Maybe it will evolve.

Are you pleased that I used Fiat in my analogy?

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