Bitmap to vector method commonly used (two)
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Freehand articles
At present, the use of vector graphics is more and more extensive. If you are good at hand-painting, of course, it is best. But after all, not everyone can draw well, and there are not many ready-made vector images that can be found online, so many people will choose to adopt them. A method of converting a bitmap into a vector. There are a lot of software that can do this work. Freehand's built-in trace tool can easily convert bitmap to vector.
Conversion steps:
Use the Import command to import the bitmap into Freehand, and then use the magic tool-like trace tool on the floating toolbar. The default settings of the trace can handle most of the conversions, but for the sake of excellence, you can't just satisfy it, we have to learn Configure different conversion parameters according to the actual situation to get the best conversion effect.
First, you need to import the bitmap you need to convert into Freehand. Please use the Import command. When the right angle symbol appears, click on the drawing area. If you are creating a new blank file, the bitmap will lead to the Foreground layer. If necessary, adjust the position first. To prevent it from moving inadvertently, please lock the layer of the bitmap first, then click on the upper right of the layer panel. The black triangle creates a new layer above the Foreground layer, which is used to place the transformed vector image separately.
Here I imported a picture of a peach blossom to experiment. Did you see the icon of the magic wand on the floating toolbar? It is the trace tool. Click on it and drag an area directly above the bitmap. The bitmap contained in the area will be converted into a vector image. If you need to convert the entire image as I do now, just drag the area. Cover the entire picture. The whole conversion time depends on the complexity of the graphics and the configuration of your machine. Just like this simple image, there is almost no delay. The result is that you are seeing a dense node, but the effect is still not clear. Please temporarily hide the Foreground, then hold down Ctrl and click on the blank space.
It can be said that according to the default settings of trace can handle most of the conversions, but more than you can not meet this, we must learn to configure different conversion parameters according to the actual situation, in order to get the best conversion results.
Double-click the trace icon to open the settings window. You can see that there are a lot of parameters to be set here, but don't be afraid, let's take a closer look.
1, Color mode: used to select the color mode, here you can set whether the final vector is color or gray, RGB or CMYK mode, and you can determine the number of colors, the more the number of colors The finer the effect, the maximum is 256 colors, and 16 colors are enough in actual use.
2, Resolution: resolution, the general default Normal is good, unless you need more details, then you can set to High.
3, Trace layers: the choice of the conversion layer, Foreground - foreground layer, Background - background layer, All - all layers, here our bitmap is in the Foreground layer, so we choose it.
4, Path conversion: conversion method. This is the most important setting and will directly affect the final result. Let's take a look at it:
Outline: It converts the bitmap into a single vector color block, which can overlap each other. This is the default option. It can be said that it is suitable for most situations. There is a small option below it - Path overlap. Path overlaps are generally set to Loose or Tight, where Tight can produce more subtle effects, and None applies to bitmaps that convert pure lines or text.
Centerline: Contrary to Outline, it uses lines to render effects, and is more suitable for images with many lines and few fills. The following Uniform lines are selected to indicate that a uniform line width of 1 point will be used, and the line width will be changed after unchecking.
Centerline/Outline: Combines the above two situations, the line color blocks are combined, mainly by the software itself, you can also set the value of their conversion, Open path below, the larger the value, the final conversion to lines The more, conversely, the patches will increase accordingly.
Outer edge: A special one, it only produces the outline of the periphery. You can fill in the color to make some special effects. Of course, if you match the paste inside, you can easily remove the background of the bitmap.
5, Trace conformity: the unity of transformation, the higher the value is closer to the original image, of course, the node will increase significantly.
6, Noise tolerance: the tolerance of noise, this is also a very important setting, the tolerance is lower than the original picture, the tolerance is too high will lose more details. To illustrate the problem, let's just look at the branch section. The tolerance on the left is set to 5, and the one on the right is 15. We remove the top color block to see it clearly. The left side is low because of the low tolerance. The variegated color, but the right side is ignored, do not underestimate these subtle variegated colors, because it is a vector diagram, the number of bytes of the image is easy to upgrade because of them. For this picture, we don't need too much detail, so the tolerance of 15 is more appropriate.
7,Wand color tolerance: color tolerance, this item only makes sense when selecting the conversion area according to the color. If you have used photoshop, you should remember that it has similar items in the magic wand settings. The value of the setting is more Large, the more relaxed the selection, all the close colors will be selected.
For this picture, we only need to modify the noise tolerance, and the effect of the transformation is shown in the figure.
Compared with other software, Freehand and Flash are the finished products of a company, just like brothers, so the converted vector graphics can be directly copied into the Flash, there is no compatibility problem.
Final optimization: For the final vector, the best case is to get as close as possible to the original image and the smaller the number of bytes stored, the better, so you can further optimize if necessary. There are two ways to do this:
The first one: Do it in Freehand, please select all the vector pictures, select Modify>Alter path>Simplify from the menu, set an Amount value, remember not to be too greedy, set to 1 is almost, too high and easy to deform.
Second: Optimize in Flash. First select all vector graphics, then press Ctrl+B, break them, select Modify>Optimize to optimize, but we do not recommend it to optimize, because sometimes the graphics change is relatively large.