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Since he doesn't summarize the test above, let me. The jpeg.io result is bigger than the other two and noticeably worse quality. The problems were with the shar
by wscott 10y ago
Since he doesn't summarize the test above, let me.
The jpeg.io result is bigger than the other two and noticeably worse quality. The problems were with the sharp lines.
Perhaps jpeg.io specializes in photo-realistic pictures rather than graphics and logos.
- iplaw 10y agoThat was your take away from the comparison? Wow ... I fail to see how the jpeg.io is worse than the other two examples.
- Paulods 10y agoLook closely around the red and yellow rectangles and just about and edge meeting the blue and you will see. Open all 3 and tab one to the next and you will notice the big difference.
- sathackr 10y agoupon first glance it looks like the lines are blurry in the jpeg.io one compared to the original and other two. If you zoom in a bit that may still be the case, but it looks like the overall image quality is much better. The photoshop export has significant artifacts visible, while the jpeg.io compressed image has far fewer visible artifacts. The tinypng version isn't jpeg compressed but shows dithering as you would expect from a GIF file.
- ThomPete 10y agoThats kind of what the format is for.
- wmil 10y agoPhotoshop is smart enough to disable chroma subsampling[1] if it will screw up the image, it looks like jpeg.io doesn't do that. One of the worst case scenarios for chroma subsampling is alternating black and red lines. Some monitors/TVs do 4:2:0 by default. It can cause problems... https://plus.google.com/photos/photo/100697962438000631056/5902440355823383874?icm=false https://plus.google.com/photos/photo/100697962438000631056/5... [1] https://en.wikipedia.org/wiki/Chroma_subsampling https://en.wikipedia.org/wiki/Chroma_subsampling
- karim79 10y agoHi, co-founder of jpeg.io and kraken.io here. Thanks for this, we're still in "kinda beta" right now and will have a fix in production shortly. In summary, that's not supposed to happen at all and there are highly likely some other nasties which we will be ironing out over the next hours.
- arekkas 10y agofor being "kinda beta" you have quite the claims up on your website
- dlbucci 10y agojpeg.io may have lost on sharp lines, but it had WAY fewer artifacts than either of the other exports, and the blue was closer to the original compared to the Photoshop export. In my opinion, it's a better quality image.
- CodeMage 10y agoHonest question: if I can't see the artifacts without zooming in, is there any reason why I should care? Of all the conversion results offered, the Photoshop export actually looks the best to my eyes, so I'm genuinely trying to understand why the jpeg.io result would be considered better quality in this particular case.
- dlbucci 10y agoI don't need to zoom in or even look that hard to see the artifacts. Maybe that's me, or maybe that's the retina display on my MacBook, but that's why jpeg.io looks the best for me. If you can't see the artifacts though, I would say jpeg.io loses out.
- detaro 10y agoFor me, it looks like a different image. As in, I would never have expected that the differences to the original weren't a (bad) choice by the "designer" making the image. That seems risky, and in many use cases a worse kind of artifact.
- deleted 10y ago[deleted]
- amelius 10y agoWould it be worthwhile to compress the edges separately? I.e., use edge-detection + dilation + quantize + mask to get the edges, then compress that less aggressively, and overlay over the aggressively-compressed image?