138 lines
6.2 KiB
ReStructuredText
138 lines
6.2 KiB
ReStructuredText
.. _bpy.types.SpaceSequenceEditor.display_mode:
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************
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Display Mode
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************
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The display mode affects how the image of the current frame is represented in the preview region.
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There are several modes available, each having a specific purpose.
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Image Preview
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=============
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The Image Preview mode shows you what the resulting video will look like when saved.
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This is the main working mode for adding strips and moving them around,
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cutting, grouping (making meta) and splicing them through special effects.
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Luma Waveform
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=============
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For the selected channel, brightness, or luminosity, is mapped with this display.
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A luma waveform allows you to judge the quality of the luminance distribution across the video signal,
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you can view a luma waveform instead of the usual output display on every control monitor.
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The display plots for every scanline the luminance value. The lines are all drawn on top of each other.
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The points get brighter if the lines cross (which is very likely with several hundred scanlines).
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You will understand the picture most easily if you plug an oscilloscope to
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the Luma-video-output of your television set. It will basically look the same.
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In this mode, the vertical axis represents the luminosity: 0 at the bottom, 1 at the top;
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the horizontal axis is a mapping from the horizontal axis of the frame.
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There are as many curves as scanlines in the frame:
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each one of these curves represents the luminosity of the pixels of one line.
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Moreover, the color of a pixel in this mode represents the number of pixels from the matching column of
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the frame sharing the same luminosity, i.e. the number of curves that cross at this point
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(black/transparent, for no pixel, white/opaque for at least three pixels).
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Separate Colors
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Separates RGB channels into separate graphs.
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This mode is good for:
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- If the waveform does not fill the whole picture you might want to play with the Brightness/Contrast modifier
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until it fills the whole picture (contrast autostretch).
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- With the more advanced Curves or Color Balance modifiers, you can be more precise.
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- You can judge if you want to dump the whole thing since it is
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completely distorted and clips at the top or the bottom.
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.. list-table::
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* - .. figure:: /images/video-editing_preview_display-mode_luma-waveform-example-1.png
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The various horizontal lines in the Luma waveform
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match the uniform-colored lines of the picture. Note that the 'gray 20%'
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one-pixel width line (inside the yellow strip) is represented in the Luma waveform by a gray line.
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The two lines drawing an "X" are from the two linear tone shades (white --> black and black --> white).
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Finally, the broken line matches the complex tone shade at the bottom of the picture.
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- .. figure:: /images/video-editing_preview_display-mode_luma-waveform-example-2.png
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The curves are quite visible. We found a luma of 80-100% for the sky,
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a luma around 40% for the sea, and a luma of 10-20% for the mountains,
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growing around 40% for the sunny part.
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.. note::
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The pictures (first green frame, at the top) are only 50px high,
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to limit the number of curves displayed in the *Luma waveform*.
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Use this display to check for appropriate contrast and luminosity across all frames in the channel.
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When spots in the film that should have even illumination do not,
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it looks like a flashbulb went off or an extra light was suddenly turned on. This can happen
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if two strips were rendered or shot under different lighting conditions but are supposed to be contiguous.
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Chroma Vectorscope
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==================
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Use this mode to judge the quality of the color-distribution and saturation, you can also view a U/V scatter-plot.
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The picture is converted to YUV-format. The U and V values represent the angle of the color.
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For pixel of the picture, one point is plotted in the display at the U and V value position.
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If several pixels happen to have the same UV value the pixel in the plot gets brighter.
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To help you understand what color is meant, a hexagram marking the extreme positions
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(red, magenta, blue, cyan, green, yellow) is shown and a red cross to mark the origin.
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In other words, for the selected channel, this display shows the color space of the image inside a hexagon.
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Each point of the hexagon is a primary color: red, magenta, blue, cyan, green, and yellow.
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Black is at the center, and overall saturation is scaled as dots closer to the outside.
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The example shown below as the second image has a lot of red (50% saturation)
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and small amount of blue, with no green.
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Always: remember to activate an additional control monitor of the end result.
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Color calibration is a matter of taste and depends on what you want.
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Use this display to check for too much color saturation.
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While over-saturated images look great for op-art and computer displays,
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they might not when shown on the big screen TV.
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This mode is good for:
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- If your picture looks very moody or desaturated you might want to take a look at the U/V plot.
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You will most likely see all pixels building a crowd at the origin.
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If you add saturation using the *Saturation* slider in the Filter panel or any modifiers that change color,
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you can see in the U/V plot if you distort the color.
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- If you do color-matching on a by hand basis you can match the angle you see of different channels monitors.
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.. figure:: /images/video-editing_preview_display-mode_example.jpg
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Example image.
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.. figure:: /images/video-editing_preview_display-mode_vectorscope.png
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Example of a Chroma Vectorscope Preview.
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Histogram
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=========
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This mode displays a graph showing the distribution of color information in the pixels of
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the currently displayed image. The X axis represents values of pixel, from 0 to 1 (or 0 to 255),
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while the Y axis represents the number of pixels in that tonal range. A predominantly dark
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image would have most of its information toward the left side of the graph.
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Use this mode to balance out the tonal range in an image.
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A well-balanced image should have nice and smooth distribution of color values.
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.. figure:: /images/video-editing_preview_display-mode_example.jpg
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Example image.
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.. figure:: /images/video-editing_preview_display-mode_histogram.png
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Example of Histogram Preview.
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