odd ghost artifacts when rendering in color

	odd ghost artifacts when rendering in color by Sami Kallinen (sami kallinen) on May 7, 2008 at 10:54:13 pm while doing some tests to verify Chad Terpstra's observations about loss of res when rotating footage, i also noticed another oddity. when rendering the chart without any added changes in color to prores hq (or to dvcpro hd) color added these faint ghost line artifacts to the image (see below). if one renders the same image out as proreshq in fcp it does not add the artifacts. anybody any idea whats going on? the samples were exported as stills from fcp and scaled to 400 percent with image magick's convert: original - with artifacts - Respond to this post     Return to posts index

	Re: odd ghost artifacts when rendering in color by Sami Kallinen on May 10, 2008 at 12:53:18 pm hi did some more tests regarding this. i think there might be something amiss with the scaling algorithms in Color. we are forced to use the prores1280x720 for dvcprohd and not prores960x720 which would be preferrable. and that seems to introduce a lot of artifacts, but that cannot be the only thing. compared to how FCP handles dvcpro hd rendered to Prores or second generation dvcpro hd Color does a much worse job. see for more details in my blog. here was the original in dvcprohd: Section of the original in 200% (open in a new window to see in 400%): Same section but of the color prores render in 200% (open in a new window to see in 400%): Difference between the above: The difference on the entire image (again open in a new window to see 1:1): Respond to this post     Return to posts index