Google is introducing a novel open-source picture format: "WebP" (pronounced ‘weppy’).
Google claims that images inward the WebP picture format volition endure about forty pct smaller than JPEG files piece providing for images that are of higher character past times almost eliminating the picture artifacts associated alongside JPEG compression. At the introduce moment, WebP is nonetheless inward a rattling early on phase of evolution together with hence, different the JPEG file format, WebP is non yet built into cameras, spider web browsers, image-editing programs, etc.
JPEG vs WebP compression at 100%
From left to right: Original image, JPEG compressed, WebP compressed. JPEG vs WebP compression enlarged
From left to right: Original image, JPEG compressed, WebP compressed.
WebP uses the Y'UV coloring model that is used inward the NTSC, PAL, together with SECAM composite coloring video standards. It is a flake similar the LAB fashion coloring model that is used inward PhotoShop, together with other imaging applications, inward that the Y component, similar the "L" channel, determines the lightness of the coloring (referred to equally luminance or luma), piece the U together with V components, similar the "a" together with "b" channels, possess upward one's heed the coloring itself (the chroma).
The Y'UV coloring model - From left to right: Original composite image, "Y" component, "U" component, "V" component.
For picture compression, WebP uses the VP8 video codec - the same methodology that is used to compress keyframes inward videos. This codec uses predictive coding to encode an picture past times using the values inward neighboring blocks of pixels to predict the values inward a block, together with and then encodes alone the divergence (residual) betwixt the actual values together with the prediction. The residuals typically comprise many cypher values, which tin endure compressed much to a greater extent than effectively.
So far, piece it is nonetheless a "lossy" compression technology, WebP compressed images sure as shooting seem to deliver a higher marking of compression (and thus smaller file size), together with much higher picture character than the electrical current criterion JPEG picture compression method. This is a proficient thing, non alone for images for spider web application, exactly maybe for impress application equally well.
Google Chrome volition probable endure the showtime consumer application to back upward "weppy" compression inward lodge to render a faster user sense on spider web sites piece reducing bandwidth together with hosting costs.
On the other hand
Since the Y'UV coloring model is similar inward main to the Lab coloring model...why non apply the same compression methodology to an picture that's inward Lab mode? I've done some testing alongside high JPEG compression of the "a" together with "b" channels of a Lab picture together with easily arrive at file sizes that are alone 20% of the master copy file size alongside no apparent picture degradation. In fact they await rattling similar to the results obtained alongside the WebP picture format.
Left picture WebP - correct picture Lab compressed using rattling high JPEG compression for the "a" together with "b" channels of an Lab image.
Left picture WebP - correct picture Lab compressed using rattling high JPEG compression for the "a" together with "b" channels of an Lab image.
If the Y'UV compression method could endure applied to Lab images together with then the graphic arts manufacture could perish on to piece of job a coloring model that is good understood together with inward piece of job today rather than import a novel coloring model from some other industry.
Google claims that images inward the WebP picture format volition endure about forty pct smaller than JPEG files piece providing for images that are of higher character past times almost eliminating the picture artifacts associated alongside JPEG compression. At the introduce moment, WebP is nonetheless inward a rattling early on phase of evolution together with hence, different the JPEG file format, WebP is non yet built into cameras, spider web browsers, image-editing programs, etc.
JPEG vs WebP compression at 100%
WebP uses the Y'UV coloring model that is used inward the NTSC, PAL, together with SECAM composite coloring video standards. It is a flake similar the LAB fashion coloring model that is used inward PhotoShop, together with other imaging applications, inward that the Y component, similar the "L" channel, determines the lightness of the coloring (referred to equally luminance or luma), piece the U together with V components, similar the "a" together with "b" channels, possess upward one's heed the coloring itself (the chroma).
For picture compression, WebP uses the VP8 video codec - the same methodology that is used to compress keyframes inward videos. This codec uses predictive coding to encode an picture past times using the values inward neighboring blocks of pixels to predict the values inward a block, together with and then encodes alone the divergence (residual) betwixt the actual values together with the prediction. The residuals typically comprise many cypher values, which tin endure compressed much to a greater extent than effectively.
So far, piece it is nonetheless a "lossy" compression technology, WebP compressed images sure as shooting seem to deliver a higher marking of compression (and thus smaller file size), together with much higher picture character than the electrical current criterion JPEG picture compression method. This is a proficient thing, non alone for images for spider web application, exactly maybe for impress application equally well.
Google Chrome volition probable endure the showtime consumer application to back upward "weppy" compression inward lodge to render a faster user sense on spider web sites piece reducing bandwidth together with hosting costs.
On the other hand
Since the Y'UV coloring model is similar inward main to the Lab coloring model...why non apply the same compression methodology to an picture that's inward Lab mode? I've done some testing alongside high JPEG compression of the "a" together with "b" channels of a Lab picture together with easily arrive at file sizes that are alone 20% of the master copy file size alongside no apparent picture degradation. In fact they await rattling similar to the results obtained alongside the WebP picture format.
If the Y'UV compression method could endure applied to Lab images together with then the graphic arts manufacture could perish on to piece of job a coloring model that is good understood together with inward piece of job today rather than import a novel coloring model from some other industry.
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