The thing is ivan if you look at it it hits exactly the edge of what the bbox was before the crop. Is that just coincidence?
Randy S. Little http://www.rslittle.com <http://reel.rslittle.com> On Thu, Jul 21, 2011 at 01:50, Ivan Busquets <[email protected]> wrote: > Hi Ron, > > I think you're hitting a float precision limit there, or rather a > limit introduced by the way most (all?) computer graphics software do > filtering operations by sampling a square area. But I'll put a big > question mark on the second assumption since I don't know the > specifics. > > If you take a classic gauss curve and apply the same gamma operation > to it, you'll see the low end starting to flatten towards 1. Now, if > you look again after your blur operations and sample in the viewer, > you'll see that the x coordinate at which the pixels turn to full > black (0) is the same on all scanlines. The value right before that is > different on each scanline, so the radial gradient is still there, but > the point where each line reaches 0 is the same. If you push that > enough, though, you're flattening all the low end values towards one, > effectively losing the small differences between them. > > The only way I can think of to get around that within your gizmo is to > set a threshold to push some of the very low end values to 0. You > could use a clamp node with the "Clamp To" turned on and set to 0, and > then set your threshold using the "minimum" knob. > > Quick example: > > set cut_paste_input [stack 0] > version 6.2 v4 > push $cut_paste_input > Sparkles { > size 30 > motion 200 > direction 60 > fadeTolerance 152 > broken_affected 6.6 > broken_start 0.3 > broken_holes 0.186 > sparks_angle 77 > name Sparkles2 > selected true > xpos -893 > ypos -348 > } > Crop { > box {0 0 2048 1556} > name Crop2 > selected true > xpos -893 > ypos -299 > } > Group { > name ExpoBlur1 > selected true > xpos -893 > ypos -224 > addUserKnob {20 ExpoBlur} > addUserKnob {14 size R 0 5} > size 2 > addUserKnob {41 strength T Grade160.white} > addUserKnob {41 curve T Grade160.gamma} > addUserKnob {41 black_clamp l "black clamp" T Grade160.black_clamp} > addUserKnob {41 white_clamp l "white clamp" -STARTLINE T > Grade160.white_clamp} > addUserKnob {41 crop l "crop to format" T Blur11.crop} > addUserKnob {41 minimum T Clamp1.minimum} > } > Input { > inputs 0 > name Input1 > xpos 389 > ypos -32 > } > Dot { > name Dot328 > xpos 423 > ypos -4 > } > set N4ba6c50 [stack 0] > add_layer {rgba rgba.beta} > Blur { > size {{parent.size**7} {parent.size**7}} > crop {{parent.Blur11.crop}} > name Blur17 > xpos 714 > ypos 100 > } > push $N4ba6c50 > Blur { > size {{parent.size**6} {parent.size**6}} > crop {{parent.Blur11.crop}} > name Blur16 > xpos 589 > ypos 96 > } > push $N4ba6c50 > Blur { > size {{parent.size**5} {parent.size**5}} > crop {{parent.Blur11.crop}} > name Blur15 > xpos 499 > ypos 104 > } > push $N4ba6c50 > Blur { > size {{parent.size**4} {parent.size**4}} > crop {{parent.Blur11.crop}} > name Blur14 > xpos 389 > ypos 106 > } > push $N4ba6c50 > Blur { > size {{parent.size**3} {parent.size**3}} > crop {{parent.Blur11.crop}} > name Blur13 > xpos 287 > ypos 108 > } > push 0 > push $N4ba6c50 > Blur { > size {{parent.size*2} {parent.size*2}} > crop {{parent.Blur11.crop}} > name Blur12 > xpos 174 > ypos 108 > } > push $N4ba6c50 > Blur { > size {{parent.size} {parent.size}} > name Blur11 > xpos 53 > ypos 115 > } > Merge2 { > inputs 7+1 > operation plus > name Merge243 > xpos 389 > ypos 233 > } > Clamp { > minimum 4e-05 > maximum_enable false > MinClampTo_enable true > name Clamp1 > xpos 389 > ypos 278 > } > set N74959c0 [stack 0] > Grade { > channels rgba > white 1.02 > gamma 11 > white_clamp true > name Grade160 > xpos 389 > ypos 358 > } > Output { > name Output1 > xpos 389 > ypos 438 > } > push $N74959c0 > Viewer { > input_process false > name Viewer1 > xpos 570 > ypos 426 > } > end_group > > > > On Wed, Jul 20, 2011 at 10:27 AM, Ron Ganbar <[email protected]> wrote: > > Is the gamma (curve) all the way up on 5 and size on 2 and you're not > > getting a square? > > > > > > Ron Ganbar > > email: [email protected] > > tel: +44 (0)7968 007 309 [UK] > > +972 (0)54 255 9765 [Israel] > > url: http://ronganbar.wordpress.com/ > > > > > > On 20 July 2011 18:19, Randy Little <[email protected]> wrote: > >> > >> did you try hooking and unhooking or leaving hooked a a black constant. > >> Its 2 am I don't know what buttons I pushed to make it work. SORRY. > BUT > >> Randy S. Little > >> http://www.rslittle.com > >> > >> > >> > >> > >> On Thu, Jul 21, 2011 at 01:16, Ron Ganbar <[email protected]> wrote: > >>> > >>> Hi Randy, > >>> Still wrong on my end... :-( > >>> Played with Blur11 - didn't seem to make any difference. > >>> Thanks for trying. > >>> > >>> Ron Ganbar > >>> email: [email protected] > >>> tel: +44 (0)7968 007 309 [UK] > >>> +972 (0)54 255 9765 [Israel] > >>> url: http://ronganbar.wordpress.com/ > >>> > >>> > >>> On 20 July 2011 18:12, Randy Little <[email protected]> wrote: > >>>> > >>>> Merry Xmas its fixed. The weird thing is that fixing was to turn off > >>>> crop to format in the blur11 then turn it back on. ????? So I don't > know. > >>>> strange. maybe it was holding onto the format from pre crop some how > for > >>>> whatever reason. > >>>> set cut_paste_input [stack 0] > >>>> version 6.2 v3 > >>>> push $cut_paste_input > >>>> Sparkles { > >>>> size 30 > >>>> motion 200 > >>>> direction 60 > >>>> fadeTolerance 152 > >>>> broken_affected 6.6 > >>>> broken_start 0.3 > >>>> broken_holes 0.186 > >>>> sparks_angle 77 > >>>> name Sparkles1 > >>>> selected true > >>>> xpos -111 > >>>> ypos -205 > >>>> } > >>>> Crop { > >>>> box {0 0 2048 1556} > >>>> name Crop4 > >>>> selected true > >>>> xpos -106 > >>>> ypos -157 > >>>> } > >>>> Group { > >>>> name ExpoBlur2 > >>>> selected true > >>>> xpos -106 > >>>> ypos -103 > >>>> addUserKnob {20 ExpoBlur} > >>>> addUserKnob {14 size R 0 5} > >>>> size 0.2 > >>>> addUserKnob {41 strength T Grade160.white} > >>>> addUserKnob {41 curve T Grade160.gamma} > >>>> addUserKnob {41 black_clamp l "black clamp" T Grade160.black_clamp} > >>>> addUserKnob {41 white_clamp l "white clamp" -STARTLINE T > >>>> Grade160.white_clamp} > >>>> addUserKnob {41 crop l "crop to format" T Blur11.crop} > >>>> } > >>>> Input { > >>>> inputs 0 > >>>> name Input1 > >>>> xpos 389 > >>>> ypos -32 > >>>> } > >>>> Dot { > >>>> name Dot328 > >>>> xpos 423 > >>>> ypos -4 > >>>> } > >>>> set N1c441b60 [stack 0] > >>>> add_layer {rgba rgba.beta} > >>>> Blur { > >>>> size {{parent.size**7} {parent.size**7}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur17 > >>>> xpos 714 > >>>> ypos 100 > >>>> } > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size**6} {parent.size**6}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur16 > >>>> xpos 589 > >>>> ypos 96 > >>>> } > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size**5} {parent.size**5}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur15 > >>>> xpos 499 > >>>> ypos 104 > >>>> } > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size**4} {parent.size**4}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur14 > >>>> xpos 389 > >>>> ypos 106 > >>>> } > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size**3} {parent.size**3}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur13 > >>>> xpos 287 > >>>> ypos 108 > >>>> } > >>>> push 0 > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size*2} {parent.size*2}} > >>>> crop {{parent.Blur11.crop}} > >>>> name Blur12 > >>>> xpos 174 > >>>> ypos 108 > >>>> } > >>>> push $N1c441b60 > >>>> Blur { > >>>> size {{parent.size} {parent.size}} > >>>> name Blur11 > >>>> xpos 53 > >>>> ypos 115 > >>>> } > >>>> Merge2 { > >>>> inputs 7+1 > >>>> operation plus > >>>> name Merge243 > >>>> xpos 389 > >>>> ypos 232 > >>>> } > >>>> set N1c474b50 [stack 0] > >>>> Grade { > >>>> channels rgba > >>>> white 1.02 > >>>> gamma 0.435 > >>>> white_clamp true > >>>> name Grade160 > >>>> xpos 389 > >>>> ypos 311 > >>>> } > >>>> Output { > >>>> name Output1 > >>>> xpos 389 > >>>> ypos 438 > >>>> } > >>>> push $N1c474b50 > >>>> Viewer { > >>>> input_process false > >>>> name Viewer1 > >>>> selected true > >>>> xpos 570 > >>>> ypos 426 > >>>> } > >>>> end_group > >>>> Randy S. Little > >>>> http://www.rslittle.com > >>>> > >>>> > >>>> > >>>> > >>>> On Thu, Jul 21, 2011 at 00:52, Ron Ganbar <[email protected]> wrote: > >>>>> > >>>>> set cut_paste_input [stack 0] > >>>>> version 6.2 v4 > >>>>> push $cut_paste_input > >>>>> Sparkles { > >>>>> size 30 > >>>>> name Sparkles1 > >>>>> selected true > >>>>> xpos -304 > >>>>> ypos 3346 > >>>>> } > >>>>> Crop { > >>>>> box {0 0 2048 1556} > >>>>> name Crop4 > >>>>> selected true > >>>>> xpos -304 > >>>>> ypos 3374 > >>>>> } > >>>>> Group { > >>>>> name ExpoBlur2 > >>>>> selected true > >>>>> xpos -304 > >>>>> ypos 3422 > >>>>> addUserKnob {20 ExpoBlur} > >>>>> addUserKnob {14 size R 0 5} > >>>>> size 2 > >>>>> addUserKnob {41 strength T Grade160.white} > >>>>> addUserKnob {41 curve T Grade160.gamma} > >>>>> addUserKnob {41 black_clamp l "black clamp" T Grade160.black_clamp} > >>>>> addUserKnob {41 white_clamp l "white clamp" -STARTLINE T > >>>>> Grade160.white_clamp} > >>>>> addUserKnob {41 crop l "crop to format" T Blur11.crop} > >>>>> } > >>>>> Input { > >>>>> inputs 0 > >>>>> name Input1 > >>>>> xpos 389 > >>>>> ypos -32 > >>>>> } > >>>>> Dot { > >>>>> name Dot328 > >>>>> xpos 423 > >>>>> ypos -4 > >>>>> } > >>>>> set Nbb6ed990 [stack 0] > >>>>> add_layer {rgba rgba.beta} > >>>>> Blur { > >>>>> size {{parent.size**7 i} {parent.size**7 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur17 > >>>>> xpos 714 > >>>>> ypos 100 > >>>>> } > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size**6 i} {parent.size**6 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur16 > >>>>> xpos 606 > >>>>> ypos 103 > >>>>> } > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size**5 i} {parent.size**5 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur15 > >>>>> xpos 499 > >>>>> ypos 104 > >>>>> } > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size**4 i} {parent.size**4 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur14 > >>>>> xpos 389 > >>>>> ypos 106 > >>>>> } > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size**3 i} {parent.size**3 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur13 > >>>>> xpos 287 > >>>>> ypos 108 > >>>>> } > >>>>> push 0 > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size*2 i} {parent.size*2 i}} > >>>>> crop {{parent.Blur11.crop i}} > >>>>> name Blur12 > >>>>> xpos 174 > >>>>> ypos 108 > >>>>> } > >>>>> push $Nbb6ed990 > >>>>> Blur { > >>>>> size {{parent.size} {parent.size}} > >>>>> name Blur11 > >>>>> xpos 53 > >>>>> ypos 111 > >>>>> } > >>>>> Merge2 { > >>>>> inputs 7+1 > >>>>> operation plus > >>>>> name Merge243 > >>>>> xpos 389 > >>>>> ypos 283 > >>>>> } > >>>>> Grade { > >>>>> channels rgba > >>>>> gamma 6 > >>>>> white_clamp true > >>>>> name Grade160 > >>>>> xpos 389 > >>>>> ypos 311 > >>>>> } > >>>>> set Nc73fb7f0 [stack 0] > >>>>> Viewer { > >>>>> viewerProcess SHOWLinAsFilm3D > >>>>> input_process false > >>>>> name Viewer1 > >>>>> xpos 570 > >>>>> ypos 426 > >>>>> } > >>>>> push $Nc73fb7f0 > >>>>> Output { > >>>>> name Output1 > >>>>> xpos 389 > >>>>> ypos 438 > >>>>> } > >>>>> end_group > >>>> > >>>> _______________________________________________ > >>>> Nuke-users mailing list > >>>> [email protected], http://forums.thefoundry.co.uk/ > >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > >>> > >>> > >>> _______________________________________________ > >>> Nuke-users mailing list > >>> [email protected], http://forums.thefoundry.co.uk/ > >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > >> > >> > >> _______________________________________________ > >> Nuke-users mailing list > >> [email protected], http://forums.thefoundry.co.uk/ > >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > > > > _______________________________________________ > > Nuke-users mailing list > > [email protected], http://forums.thefoundry.co.uk/ > > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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