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mrc_hlp
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1993-08-30
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\ApAssist
\: - This is the Quick Help for the process clipping panel -
\: ---------------------------------------------------------------------
\: Written by David E. Patterson
\: ---------------------------------------------------------------------
\font topaz.font 8
\tc 1
\wr
\lj
\dd "imh_descriptor"
\index "hlp_index/index"
\toc "hlp_toc/toc"
\help "aa_help/help
\node "mrc_clipreg"
\title "Clip Region"
\next "mrc_clip2"
\prev ""
This allows you to \{ \ts i clip \} out a region of the primary buffer. The
area selection can be any of the area selection tools available. The area is
selected by using the left mouse button to size the area (unless the area
selection is \{ \ts i \tc 10 freehand \} ) , and both buttons to move the
location of the area selection. It is important to remember that clipping
out a region will create a new buffer, and new buffers means more memory will
be used.
See Also: \{ \ts b \tc 15 \link "Re-sizing and Clipping" "mr_hlp/mr_resize"
\}
\endnode
\node "mrc_clip2"
\title "Clip 2x"
\next "mrc_clip5"
\prev "mrc_clipreg"
This allows you to clip out a region, and the clip will be twice the size
both horizontally and vertically.
\endnode
\node "mrc_clip5"
\title "Clip .5x"
\next "mrc_stepzoom"
\prev "mrc_clip2"
This allows you to clip out a region, and the clip will be half the size
both horizontally and vertically.
\endnode
\node "mrc_stepzoom"
\title "Stepped Zoom"
\next "mrc_pad"
\prev "mrc_clip5"
This tool allows you to specify scale factors for the clipped region. You
may scale the clip by .5 or 2 in either or both horizontal and vertical
directions.
\endnode
\node "mrc_stretchzoom"
\title "Stretch Clip"
\next ""
\prev ""
This allows you to \{ \ts i stretch \} the specifed clip to a specific
percentage or pixel size.
\endnode
\node "mrc_pad"
\title "Pad to aspect"
\next "mrc_padcan"
\prev "mrc_stepzoom"
This operation allows you to clip a region, and then that region will be
anti-aliased so that the new buffer will not appear \{ \ts i pixelized \} .
The new aspect ratio for the clip will be automatically calculated.
See Also: \{ \ts b \tc 15 \link "Aspect Ratio" "mrc_imageaspect&dpi"
\}
\endnode
\node "mrc_padcan"
\title "Pad Canvas"
\next "mrc_clipexact"
\prev "mrc_pad"
This tool allows you to pad the selected clip to a new size. The padded clip
can then be placed in any one of nine specific locations. This is a great
way to center a clipped region on a blank display.
\endnode
\node "mrc_clipexact"
\title "Clip with Exact Size"
\next "mrc_clipzoom"
\prev "mrc_padcan"
This allows you to specify an \{ \ts i exact \} rectangular region to be
clipped out. You will not be allowed to clip a region that is larger than
the image size.
\endnode
\node "mrc_clipzoom"
\title "Zoom Clip"
\next "mrc_imageaspect&dpi"
\prev "mrc_clipexact"
This allows you to zoom in a specific amount into the primary image. The
intension of this tool is to allow zooms within animations sequences to be
generated in a natural way. There are controls to specify the percentage of
the zoom and the output resolution. It is important to remember that the
output resolution will default to the resolution of the \{ \ts i current \}
primary image.
\endnode
\node "mrc_imageaspect&dpi"
\title "Set Image Aspect & DPI"
\next "mrc_rescaledpi"
\prev "mrc_clipzoom"
This allows you to set the aspect ratio for the iamge. Aspect ratio
represents the \{ \ts i correct \} dimensions of the individual pixels in the
image. You can change the aspect ratio to a number of standard ratios, or
select your own.
The aspect ratio it self is a value which is normally near 100. It is the
percentage which represents the width of the pixel divided by the height
multiplied by 100. The resulting value is expressed as a percentage. As an
example, the aspect ratio for a 320x200 image is calculated as follows:
\{ \ra \image "Clips/Bullet2.pic" l 10 \cap
First, the size of the disered output area (screen, output paper, etc) must
be measured for length and height.
\}
\{ \ra \image "Clips/Bullet2.pic" l 10 \cap
Next, the pixel width is determined by dividing the width of the output
device by the number of pixels. For example, 320 pixels is aproxximatly 10.5
inches on our 1084 monitor. The pixel width would be: (10.5/320) = .033
inches/pixel horizontally.\}
\{ \ra \image "Clips/Bullet2.pic" l 10 \cap
The same process would be used to determine the height. For example, we
found that in non-interlace mode the displayed region was 8 inches. The
pixel hieght would be: (8.0)/200) = .04 inches vertically. \}
\{ \ra \image "Clips/Bullet2.pic" l 10 \cap
The aspect ratio can now be calculated. For example, using the previouss
values: (.033/.04)100 = 83%. This process can be repeated for any number of
resolutions.\}
\endnode
\node "mrc_rescaledpi"
\title "Rescale From DPI"
\next ""
\prev "mrc_imageaspect&dpi"
This allows you to rescale the clip by selecting the X and Y DPI. You can
then name and display the buffer.
\endnode