From the course: NUKE NUGGETS
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010 The unpremultiply operation explained - Nuke Tutorial
From the course: NUKE NUGGETS
010 The unpremultiply operation explained
- [Voiceover] Hi, this is Steve Wright, welcoming you to this weeks Nuke Nugget, premultiply and unpremultiply demystified. By the way, this week there are no exercise files. If mishandled, premultiply and unpremultiply operations can introduce dark edges around your composites, so you need to understand them to avoid adding problems to your comps. A lot of folks find the whole premultiply unpremultiply story very confusing, so in this video, we'll see exactly how it works. Oddly enough, the source of confusion is mostly due to the unfortunate history behind the choice of its confusing name, premultiply, so here's the story. In the early days of CG, they originally had, you know, slow computers and not very smart software, so they actually rendered the CG element first, as the RGBA layer only, with no alpha channel, so all of these pixels, even though they might have been semi-transparent in the final analysis, were rendered at full color. Then they would render the alpha channel…
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- 104_slot_gags.zip
- 103_Reconcile3D_node.zip
- 102_node_ops.zip
- 101_grain_management.zip
- 100_Unspill.zip
- 099_wire_removal.zip
- 098_marker_removal.zip
- 097_log_sharpen.zip
- 096_Write_offset.zip
- 095_rate_curve.zip
- 094_speed_control.zip
- 093_transform_nodes.zip
- 092_perspective_paint.zip
- 091_planar_tracker_holdouts.zip
- 090_material_nodes.zip
- 089_Regrain_node.zip
- 086_dilate_erode.zip
- 085_render_UV_maps.zip
- 084_embossing.zip
- 083_roto_ripple_edit.zip
- 082_texture_map_sphere.zip
- 081_planar_track_pans.zip
- 080_luma_transfer.zip
- 079_track_out_of_frame.zip
- 078_wound_reveal.zip
- 077_color_nodes.zip
- 072_IBKGizmonode.zip
- 071_IBKColour_nodept2.zip
- 070_IBKColour_nodept1.zip
- 067_precorrect_greenscreen.zip
- 059_imagearray.zip
- 001_wireframe_over_2D.zip
- 002_lightglows.zip
- 003_orbiting_camera.zip
- 004_Reformat_tricks.zip
- 005_Grade_colormatch.zip
- 006_parameterfieldmath.zip
- 007_gradient_tricks.zip
- 008_3Dflag_animation.zip
- 009_nodeindicators.zip
- 010_unpremultiply_explained.zip
- 011_unpremultiply_workflows.zip
- 012_Merge_magic.zip
- 013_relative_addressing.zip
- 014_bump_map.zip
- 015_glam_pass.zip
- 016_demo_reel.zip
- 017_interlaced_video.zip
- 018_3_2_pulldown.zip
- 019_soft_clip.zip
- 020_Roto_clone.zip
- 021_path_of_motion.zip
- 022_light_flicker.zip
- 023_chroma_subsampling.zip
- 024_paint_in_picture.zip
- 026_plus_vs_screen.zip
- 027_starfields.zip
- 028_GenStar_gizmo.zip
- 029_GenStar_advanced.zip
- 030_productivity_tools.zip
- 031_expressions.zip
- 032_math_functions.zip
- 033_concatenation.zip
- 034_Grade_match.zip
- 035_masking_workflows.zip
- 036_timeline.zip
- 037_chromakey.zip
- 038_Roto_cornerpin.zip
- 040_velocity.zip
- 041_lumakeys.zip
- 042_screen_leveling.zip
- 043_feather_falloff.zip
- 044_user_knobs_intro.zip
- 045_user_knobs_advanced.zip
- 046_master_disable.zip
- 047_Grade_secrets.zip
- 048_conditionals.zip
- 049_search_replace.zip
- 050_viewer_wipe_controls.zip
- 051_textures.zip
- 052_viewer_productivity.zip
- 053_projections.zip
- 054_sidebyside.zip
- 055_gainwithoutgrain.zip
- 056_timemarkers.zip
- 057_positionpasstracking.zip
- 060_TimeEcho_cleanplate.zip
- 061_normal_relighting.zip
- 062_image_lineup.zip
- 063_viewer_magic.zip
- 064_about_timept1.zip
- 065_about_time_pt2.zip
- 066_hierarchical_roto.zip
- 068_curve_editor.zip
- 069_animation_time.zip
- 073_fog.zip
- 074_edge_grading.zip
- 075_resize_rotos.zip
- 076_edge_extension.zip
Contents
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010 The unpremultiply operation explained8m 27s
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011 Unpremultiply workflow examples9m 52s
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012 Get more out of the Merge node5m 35s
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013 How to do relative addressing3m 58s
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014 How to create a bump map9m 35s
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015 How to do a glam pass7m 54s
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016 Edit your demo reel in NUKE8m 12s
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017 How to work with interlaced video9m 8s
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018 Work with 3:2 pulldown video5m 57s
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019 Protect your shots with a Soft Clip15m 27s
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020 How to clone and reveal with roto shapes10m 32s
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021 Create a true path of motion9m 59s
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022 Automate your flickering lights6m 13s
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