On Fri, Oct 24, 2008 at 12:14 AM,
> I have some comments on Bhaaluu's onion-skinning tutorial which is
> included at the end of this message.

WOW! Your comments and suggestions are invaluable! This post is a keeper.

One other little thing that I did that I found very helpful. Usually a
that is made into a video doesn't translate very well into an MPEG video because
the pencil lines are too light/thin, or something. What I did to make the lines
darker was this on each PPM that I saved:

Filters > Artistic > Cartoon...
  [X] Preview
  Mask Radius: 23.27
  Percent black: 0.500

Now, I really don't know what those things do, so I just played with the sliders
until I got what I wanted. What I wanted just turned out to be the
above settings.

I can't wait to try the new tutorial out!
Gimp-GAP tutorials are hard to find, even with Google, so this is a jewel.
Thank you ever so much, saulgoode.
b h a a l u u at g m a i l dot c o m
Kid on Bus: What are you gonna do today, Napoleon?
Napoleon Dynamite: Whatever I feel like I wanna do. Gosh!

> Step 9 instructs the user to perform a "File->Open" the second frame
> (f_000002.xcf). When using GAP, you should not use File->Open to
> navigate frames; use one of the commands: "Video->Go To" (which is
> useful to assign keyboard shortcuts), "Video->Playback" (which
> provides some nice "scrubbing" functionality), or "Video->VCR
> Navigator" (which provides easy cut-n-pasting of frames). Not only
> will the operation take much less time, but some operations depend
> upon GAP managing the displays. Step 9 should instruct "Video->Go
> To->Next Frame".
> In Step 8, the Stack Position line should have a "0" in it; specifying
> that the onionskin layer should be placed at the top of the layerstack.
>    Stack Position: 0 [From Top]
> In Step 10, the onion-skin layer should appear above the background
> layer in the layerstack and it should be unnecessary to lower it (if
> the instructions in the preceding comment are followed).
> In Steps 11 to 14, it would probably be better to use the Move Tool to
> align the layers, rather than the Selection Tool. The method that
> Bhaaluu proposed will only work with older versions (2.2 and earlier)
> of GIMP, whereas using the Move Tool works with all versions. The Move
> Tool permits the keyboard cursor keys to be used for moving in
> single-pixel increments (or SHIFT-cursor for larger steps). This also
> eliminates the need to make a selection and the need to anchor the
> layer.
> Instead of performing Steps 15 and 16, just move on to the next frame.
> Because the onionskin setup includes the "Auto delete before saving",
> the XCF file which gets saved (before you go to a different frame)
> will not have the onionskin layer. After you are done with all of your
> editing, delete the onionskin configuration, and use the
> "Video->Frames Convert..." command to save your results as PNM files.
> In Step 17, again "File->Open" should not be used. To navigate to the
> second frame, use one of the methods suggested in my first comment.
> Finally, the instructions of Step 19 suggest that using onionskin
> layers is not the best approach for this task. Onionskinning is useful
> if you want to align frame 2 with frame 1, frame 3 with frame 2, frame
> 4 with frame 3, and so on. It is not a particularly good method to
> align frame 2 with frame 1, frame 3 with frame 1, frame 4 with frame
> 1, etc.
> I would propose the following approach to accomplish the latter task
> (the first seven steps are identical to Bhaaluu's tutorial):
>  1. Create new directory and save all PNM files to the new directory.
>  2. Change to the new directory, and create a directory: PNM
>  3. Copy all the PNM files to the PNM directory. This is a backup.
>  4. Open The Gimp.
>  5. File > Open > f_01.pnm
>  6. Video > Frames Convert...
>         Extension: .xcf
>     GAP saves all the PNM files as XCF files, in sequential order.
>  7. Close f_01.pnm.
>  8. In f_000001.xcf window, perform an "Image->Duplicate". A new
> "Untitled" image should be displayed.
>  9. In f_000001.xcf window, perform a "Video->Move Path". Change the
> Stepmode to "None" and change the Opacity to "50%" (the From and To
> frames should be the first and last frames). Press OK. -- this will
> create a copy of the first frame as the top layer of each of the frames.
>  10. Perform a "Video->Go To->Next frame". (You should assign this
> command to a keyboard shortcut. I have assigned my F5, F6, F7, and F8
> keys to First, Previous, Next, and Last frame commands respectively.)
>  11. Activate the bottom layer ("Layer->Stack->Select Bottom Layer").
> This is conveniently accomplished with the END key.
>  12. Activate the Move Tool (keyboard shortcut "M"). Hold down the
> SHIFT key and use the mouse to align your registration points (or use
> the cursor keys)
> Repeat Steps 10 through 12. This amounts to the following keystrokes:
> F7, END, cursor keys and should be rather quick to accomplish. If it
> is necessary to use the Rotate Tool, you will have to anchor the
> floating layer.
>  13. Go to the first frame ("Video->Go To->First Frame")
>  14. Perform a "Video->Frames Layer Delete" and delete "layerstack:
> 0" from the first to the last frame (leaving only your background).
>  15. Perform a "Video->Frames Convert..." as in Step 6, only change
> the extension to ".pnm".
> The GAP is rather intimidating at first; but it can be a powerful tool
> for accomplishing repetitive image editing tasks, not just animations.
> --------------------------------------------------------
> ==============================
> ==============================
> On Thu, 23 Oct 2008, Bhaaluu wrote:
> Recently, I asked a question about how to use the Onionskin feature
> of the Gimp Animation Package. The following is a Summary of what I
> did to align a series of drawings that had registration crosshairs
> with the crosshairs on the first drawing, so all the drawings would
> be registered with each other. The drawings were all scanned into
> the computer using a flatbed scanner. All the drawings were saved
> as PNM image files from the scanner. The directions I was given were
> good for onionskinning a drawing with the one right behind it in
> numerical order. I slightly modified those instructions to align all
> 62 drawings with the very first drawing.
>  1. Create new directory and save all PNM files to the new directory.
>  2. Change to the new directory, and create a directory: PNM
>  3. Copy all the PNM files to the PNM directory. This is a backup.
>  4. Open The Gimp.
>  5. File > Open > f_01.pnm
>  6. Video > Frames Convert...
>         Extension: .xcf
>     GAP saves all the PNM files as XCF files, in sequential order.
>  7. Close f_01.pnm.
>  8. In f_000001.xcf window:
>         Video > Onionskin > Configuration...
>             Reference Mode: Normal
>             Onionskin Layers: 1
>             Frame Reference: -1
>             Stack Position: [X] From Top
>             Opacity: 50.0 / 100.0
>             Select Mode: All Visible (ignore pattern)
>             [X] Auto create after load
>             [X] Auto delete before save
>          Click [Okay]
>  9. File > Open > f_000002.xcf
> 10. In the Layers window, make sure the onionskin_000001 layer is above
>     the Background layer otherwise, the onionskin effect can't be seen.
>     I used the down arrow in the Layers window to move the Background
>     down one. That will make the onionskin appear.
> 11. Lasso both drawings.
> 12. View > Zoom to whatever magnification you need to align the cross-
>     hairs. I used 200%.
> 13. With the mouse cursor inside the lassoed area, press the mouse
>     button and drag until the crosshairs are aligned.
> 14. Click outside of the lassed area to anchor the drawing.
> 15. Right click the onionskin_000001 layer in the Layers windows and
>     Delete Layer. Clean up drawing with eraser, or whatever.
> 16. Save the file.
> 17. File > Open > f_000002.xcf
> 18. Move the Background under the onionskin layer in the Layers window.
> 19. Video > Onionskin > Configuration...
>         Frame Reference: -2
>     Click [Okay]
>     What this does is makes the first drawing the reference drawing.
>     On each new drawing I open, I will move the Background below the
>     onionskin layer, and change the Frame Reference in the Onionskin
>     Configuration. The next change will be to -3, then -4, and so on.
>     Each time this is done, new onionskin layers are built for the
>     remaining files, so this may not be good if you have 1000's of
>     drawings. It wasn't so bad with only 62 drawings.
> 20. Follow steps 11 to 16.
> I make videos for YouTube with PPM files, so I did a Save As... after I
> saved each XCF file, and saved a PPM copy of the registered image of
> the drawing in a PPM directory as I went along. Likewise, I organize
> the other files in the same way: XCF files go in a XCF directory, etc.
> I found out that if a drawing was cocked, I could first align the
> crosshairs, then use the rotate tool with the center placed on the
> aligned crosshairs, to uncock it. My experience doing this has
> convinced me that attaching a pegbar to the scanner is the best
> way to solve the problems I experienced. This is my first flatbed
> scanner, so I'm learning things the hard way..
> Many thanks to "saulgoode" for the expert instructions that allowed me
> to use The Gimp GAP Onionskin tool to do exactly what I wanted to do!
> I believe that what I am posting is correct to the best of my knowledge.
> Your mileage may vary. I am not responsible for how you use this info,
> nor for any damage which may directly or indirectly occur as a result
> of you using this info. Best of luck in all your Gimp-GAP adventures!
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