Author Topic: black patches while working on project  (Read 6638 times)

July 29, 2015, 01:54:00 PM
Read 6638 times

Grafxgurl

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I have had this problem all day, why does this black patch show up each time i go to edit a shape?

July 29, 2015, 02:28:42 PM
Reply #1

brynn

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Hhmm, it's hard to say....  Is it always the same black patch?  Or is it different shapes and in different places on the page, when it shows up?

I've never seen an Inkscape canvas that looks quite like that, so I'm not sure exactly what's going on.  I mean with that jagged black thing.  That might be simply a bug in the display, and it's not really jagged.  Or maybe it is?

But it looks like might be laboring in perhaps a less efficient workflow, than what might be possible.  Since you asked about comics in your other topic, I'm curious if you're using the photo as a base for a cartoon/comic character?  Or are you going for a photorealistic effect?

If it's photorealistic, you'll want to leave the powerstroke tool in the garage (as they say).  If it's for the comic/cartoon character, that IS a good tool, but you may not be getting the best result that it was designed for, in the way you're doing it.

Gosh....but before I go further, than that....  You know, I just can't tell from the screenshot.  Would you mind attaching the SVG?  I want to find where that jagged black thing and the blotch is coming from.

Or if you don't want to upload it, that kind of effect usually is a result of nodes that are not either connected properly, or broken apart properly.  Beyond that, I can't go, without being able to look at the SVG file.

Or maybe someone else has an idea?
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July 29, 2015, 02:50:52 PM
Reply #2

Grafxgurl

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each time i try to move the page, it goes entirely black then slowly the patches disappear, then when I try to edit any node, patches show up randomly. Im trying to just trace the eyes right now, just to practice and Im using the pencil tool then editing the paths...so those black areas dont really exist. they just show up and shift around the page. i cant see what im doing sometimes!

July 29, 2015, 03:31:43 PM
Reply #3

Grafxgurl

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Also, im having trouble fixing some fill and stroke issues. I drew a shape with the bezier tool, the Fill shows its filled with a flat color selected, but theres no fill...and the stroke shows its not on but the shape is like a stroke :?boy: im so confused. I double clicked the bezier tool and tried to change the fill and stroke settings but i cant change it....i cant change the settings so i can draw shapes with just a stroke and no fill, and if i want to fill in a color, i cant seem to get it to do it....i checked out the other post with the fill problem here...but i cant seem to fix the issue... :beg: There also seems to be some gaps and holes in the lines at the corners...im actually used to Illustrator so im trying to learn Inkscape and its a lot harder to change settings for the tools... can you help me with a step by step?

July 29, 2015, 04:34:18 PM
Reply #4

Lazur

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Rendering issue on the first one, I would say.
At least in 0.48 if there were thousands of nodes in one path it did generated a similar issue.

The opacity at 0% makes it more weird.
There is a new renderer in 0.91, I haven't tested.


On the second one, you use a powerstroke live path effect, which is probably unnecessary.
Open the live path effect editor (in path menu) and remove it.
Then you can add a stroke colour instead fill to the path.


If you want to edit the shape of the stroke and keep the powerstroke lpe,
keep an eye to the fill rule and change it to non-zero.
Also the handle of the bottom right segment would better be rotated, facing more the other neighboring node.

July 29, 2015, 05:36:50 PM
Reply #5

Grafxgurl

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thanks for replying. How do I prevent using power stroke in the future? i didnt even know what that was. Is there a setting i need to watch out for? or how do i turn it off? what is it used for? ETA, I probably sound dumb with all these questions but im honestly floundering around here. :help2:

July 29, 2015, 06:18:58 PM
Reply #6

Lazur

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Powerstroke is a relatively new feature, first released in 0.91.
The pen and the pencil tool has an option to use a shape -triangle in/out, circle, from clipboard, none.
Previously all of these were implemented by a pattern along path lpe, but now the triangle and circle (?) options use the powerstroke (I'm still on 0.48).

Just set the shape to none and no effects will be included.


Don't be afraid of all the options, most 2D vector art is just about how you place the nodes and adjust the handles. We all started somewhere (and if confused, just take a look at blender -3D vector modelling- ;).

July 29, 2015, 06:24:55 PM
Reply #7

brynn

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Here's a screenshot of the Pencil control bar.  The tool control bar is the 3rd bar from the top, if you count the menus as a bar.  The options on that bar change, depending on which tool you''re using, and this is how it looks for the Pencil.

 [ Invalid Attachment ]

If you set the buttons and the Shapes dropdown menu just like in the screenshot, you will be drawing simple paths.  (set Smoothing for whatever you want - mine is probably a little too smooth for most people)  The same goes for the Pen tool, except the control bar is slightly different.  Actually, the Pen tool would probably be the best for what you're doing.  But this is how we learn, right?  You have to try, and learn what the tool does, and try again.  You might not need that right now, but you'll remember it months from now, when you're trying to do something else (for example, I mean).

When you use certain Shape options, you get various fancy types of lines, such as the power stroke or pattern along path.  So keep that set to None, until you're ready.  And also make sure you're in Regular Bezier mode with the other button.

If the black blotchy stuff shows up when you drag something, that could mean a couple of things.  It could be the file is huge.  Or it could be a bug.  How large is that file?  If it's not huge, you might just need to switch to a different version of Inkscape (to avoid a bug).  So also please tell us which version of Inkscape you're using.

If 0.91, when you imported the photo, there were several options to choose from.  Have you ever changed those or do you always use the defaults?

Quote (selected)
Also, im having trouble fixing some fill and stroke issues. I drew a shape with the bezier tool, the Fill shows its filled with a flat color selected, but theres no fill...and the stroke shows its not on but the shape is like a stroke :?boy: im so confused.

Don't worry, we'll get you all fixed up   :wink1:

" the stroke shows its not on but the shape is like a stroke"  This is probably because you're using one of those fancy lines. You didn't show us the tutorial you mentioned in your other topic, but you said you had learned how to make brush stroke outlines.  So your Pen or Pencil or both may be still set to draw like that.  Once you set it back to defaults (like in the screenshot) it will draw regular paths.

"Also, im having trouble fixing some fill and stroke issues. I drew a shape with the bezier tool, the Fill shows its filled with a flat color selected, but theres no fill...."

For that, check out this little article/tutorial:  http://forum.inkscapecommunity.com/index.php?action=articles;sa=view;article=18.  It will explain everything  :)

I've never used Illustrator, so I won't be able to compare.  But we can all tell you how Inkscape works!
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July 29, 2015, 06:53:20 PM
Reply #8

Grafxgurl

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Thanks Lazur and Brynn! i will get my head around this ! Thank for the detailed help. I am using 0.91 version. Should i download an earlier version?
It also helps that i dont try this while hungry!  :ty1:

July 29, 2015, 07:23:36 PM
Reply #9

brynn

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In 9.1, the problem with the photo could be how you imported it.  I guess you don't remember that? 

How large is the file?

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July 29, 2015, 09:00:50 PM
Reply #10

Grafxgurl

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so i went to file, import and its a jpg , size is 21.9 kb...so not too big... also when i scroll up or down or move the working are around those black patches appear and cover up random parts so i cant see the area im trying to work on...sigh.
ive looked around and apart from the 90 degree rotate option, is there any way i can rotate an object manually?


Also,  i would really like to draw lines using the triangle in option with the pencil. Each time i draw a line with it, the path effects palette shows the power stroke. So i go in and delete it and then the line just turns into a normal line . is there no other way i can draw the tapering line without the power stroke?

i watched this youtube video using the triangle in option and thats what i want to do...but how!?


July 30, 2015, 03:38:51 AM
Reply #11

Lazur

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In the video the powerstroke is used. The stroke has a magenta handle you can adjust the width with.
If you want to use that, don't delete the effect from the list of the lpe-s.


0.91's cairo renderer has some known bugs, for example on win 64 it usually crashes with imported raster images.
You can check the bug tracker, if it has already been posted.

July 30, 2015, 09:04:49 AM
Reply #12

Grafxgurl

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ok ive seen the magenta dot and wondered what it was. I hope whatever's causing the "blackouts" gets fixed . Thank you for taking the time to help me!

July 30, 2015, 07:57:56 PM
Reply #13

brynn

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"Magenta handle"??  I've been thinking of making a feature request, to have the ability to make those nodes to whatever color one wants it to be.  Because for me, that node is a pale pink, and often hard to see at all.  I would make it solid black or maybe a dark color, if I had a choice.

I still haven't looked at the video, but I was thinking probably it was made before 0.91 came out.  Except Lazur mentioned it does show the PS.  Anyway it was with 0.91 where Triangle In turned into the powerstroke.  Certainly you can use it if you need to.  I never was clear exactly what you're doing.  But it looked like the powerstroke wasn't quite right (for that particular screenshot).

But now you know the difference, and you can use whichever one you happen to need.  I think Triangle Out is the same thing (powerstroke).  But the Ellipse shape is still like the Triangle shapes used to be - just plain Pattern Along Path.  I'm not sure what the Clipboard option does anymore (I should look).

However, if you really do need the original Triangle shapes, without the powerstroke, there is a way to do it.  Let us know if you need, and we can explain.  For that, the width of the line isn't individually adjustable, like with powerstroke. It's the same width, every time you use if (unless you  start with a different pattern each time).

0.91's cairo renderer has some known bugs, for example on win 64 it usually crashes with imported raster images.

I have not heard that before.  And in fact, I've imported rasters into 64-bit on Windows without any problems.

I think there might be some things you can do, that might stop that display problem.  I thought I had asked for the SVG file, and I was going to test.  But if you don't want to share it, try this.

Select the imported JPG.  Object menu > Object Properties > Image Rendering.  There, I think it's "Optimize Blocky" that you need.  But I'm not sure, so you can try the other one "Optimize Speed".  With blocky, it will allow you to see the pixels, if you zoom in far enough.  So if you don't like that, then don't use it.  Although if it solves the problem, it might be worth it.  I'm not sure what "Optimize Speed" does -- I guess I should try it.  If it already is one of those, try switching to "Auto".  Those options are available at the time you import the image too, if you know ahead of time what you need.

If none of those work, you could try installing the 32-bit version of Inkscape.  But I think they're both the same, with that particular problem.  However, this display issue really only gets to be a problem with a large file size.  That's why I wonder if you have some extra things in the file that you might not really need.  Do you have any other imported raster images in the file?  Or maybe multiple copies of this 1 photo?

It's not the size of the JPG that matters for the display issues I'm thinking of.  It's the SVG file size.  And when you import a JPG (or any raster image) and embed it, it makes the SVG file size much bigger.  If you choose link instead, it won't boost the SVG file size as much - but if you take the SVG to another computer, the JPG won't be there.  So you have to choose which one you want

I have a fairly large SVG with an imported photo, and I have the black blotch issue all the time, when I zoom in.  And I already switched it to blocky.  That helped some, but if I zoom too far, the black blotches come back.  The larger the file gets, as I continue to work on it, the worse the display problem is.  So that's why I'm wondering how large your SVG file is.  There may be ways to reduce the file size, and that will make the display problem less.

It seems we haven't pointed you to the manual  yet.  It's in Help menu > Inkscape manual, and that will open up the online manual automatically (if your connected to the internet.  It's not hard to use.  But I would strongly recommend Help menu > Tutorials.  The first and 2nd one will give you all the basics for using Inkscape!

There are a couple of ways to rotate an object.  Using the Selection tool  :sel:, click on the object you want to rotate.  Then click on it a 2nd time.  Notice how the arrows change when you click the 2nd time?  Click again.  See, they change back.  So when you have the rotation arrows, you can grab the arrows and drag, and the object rotates.  If it's not too big,  you 'll be able to see it rotate.  But if it's either a very big object, or the file is large, the rotation might not be very smooth.

If you need to rotate by any specific or precise amount, you can use Object menu > Transform > Rotate.
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August 03, 2015, 12:26:06 PM
Reply #14

Grafxgurl

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There is no svg file. I am trying to trace over a 21 kb size jpg. Each time i close the node there are big splotches and those zigzag lines. I will try the blocky option. Thanks!

August 03, 2015, 01:22:31 PM
Reply #15

brynn

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There has to be an SVG file.  When you finish working, and you save the file, it's saved as an SVG....unless you're saving it in some other type of format....?

In any case, the next time you open it, do File menu > Save As and save an SVG file.  Then you can upload it here.

This kind of display problem should not be occuring in a file that has 1 single imported JPG....unless it's either huge, or is a high resolution image (or both).  The reason I want to find out, aside from helping you, is if there's some kind of bug, the developers should be told about it.
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