« Stitch Era - créer une broderie à partir d'une image matricielle » : différence entre les versions

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== Introduction ==
== Introduction ==
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; Materiel  
; Materiel  
: Vous pouvez utiliser une image quelconque. ATTENTION! Si vous utilisez des images du web, veillez  à utiliser des images sans droits d'auteurs.  
: Vous pouvez utiliser une image quelconque. ATTENTION! Si vous utilisez des images du web, veillez  à utiliser des images sans droits d'auteurs.  
:[[Fichier:Vdauteur.png|vignette]]
[[image:1.png|thumb|800px|none|Color reduction with the Image Filtering Tool: Image on the left = 32 colors, image on the right = 6 colors]]
[[image:1.png|thumb|800px|none|Color reduction with the Image Filtering Tool: Image on the left = 32 colors, image on the right = 6 colors]]



Version du 7 octobre 2017 à 07:28

Introduction

Avant de vous lancer dans des conceptions de broderie compliquées soit à partir de photos ou bien de dessins créés par vous même directement sur le logiciel, vous pouvez vous familiariser avec le logiciel d'une façon beaucoup plus simple. Ceci en utilisant directement une image web! Il s'agit d'importer une image dite matricielle. Alors, allons-y!

Home page
Création de Stitch Era - logiciel de broderie machine et de hotfix
Learning goals
Etre capable d'importer une image matricielle
Etre capable de vectoriser une image matricielle, c'est à dire transformer l'image sous forme de graphique vectoriel
Etre capable de digitaliser un graphique vectoriel
Prérequis ou autres pages qui peuvent aider (Pas de craintes ceux ci sont moindres!)
Création de Stitch Era - logiciel de broderie machine et de hotfix (Créer une nouvelle page).
Stitch Era - créer une broderie à partir d'un dessin vectoriel
Materiel
Vous pouvez utiliser une image quelconque. ATTENTION! Si vous utilisez des images du web, veillez à utiliser des images sans droits d'auteurs.
Vdauteur.png
Color reduction with the Image Filtering Tool: Image on the left = 32 colors, image on the right = 6 colors


. Attention You can reuse the pictures. In the wiki, click on a picture to make it larger, then click again and save it. You can try with your own pictures, but do avoid photographs !
Quality and level
This text should technical people get going with Stitch Era. I use it for an optional master degree course in educational technology.
Last major update
September 2011. Since then some features e.g. file import was improved. Also the menu organization did change somewhat. We will try to fix this in some near future - Daniel K. Schneider (talk) 15:59, 17 August 2017 (CEST)
Next steps
  • Stitch Era - adjusting stitch sections explains how to change parameters embroidery sections, e.g. stitch density, fill patterns, etc. after and auto-digitizing procedure.
  • Stitch Era - vector graphics. You don't necessarily need to learn how to draw vector graphics that you then can convert to embroidery (stitch sections). However, you will be able to speed up your work and you also could reuse principles (e.g. Bezier drawing) for manipulating stitch sections as well as in other multi-media programs.

Graphics formats and file extensions

There exist two types of graphics file formats

Vector graphics are "mathematical" definitions of drawings and are in principle much easier to digitize. Vectors graphics are fully scalable, i.e. they will not loose quality if you change its size. Typical programs to create vector graphics are Inkscape (free), Illustrator and Corel Draw. Stitch Era can import SVG drawings or proprietary Corel Draw and Illustrator formats. Typical file formats are *.ai, *.svg, *.cdr, *.wmf and *.emf. Stitch Era includes its own vector graphics drawing program and it may be used in the first stage of designing an embroidery. You can use this module to fix imported vector graphics and/or to draw your own graphics objects. Read the Stitch Era - creating embroidery from vector images to learn how to turn vector graphics to stitches.

Bitmaps (also called raster graphics) define a picture, e.g. a drawing or a photograph, in terms of little dots (color pixels). Bitmaps, by definition are lossy in two ways: (1) You cannot resize a picture without loosing quality. (2) Most file formats allow to compress (reduce the size) of a picture in a way that will loose some information. Bitmap drawings that appear to be crisp are in fact not. However, most clipart found on the Internet are bitmaps, unfortunately. Digitizing bitmaps usually implies a first translation to vector graphics as you shall learn. That process is called vectorizing. You could directly digitize a cleaned up bitmap file to stitch sections, but I wasn't satisfied with the result and therefore will not introduce this in any tutorial.

Typical bitmap file formats are *.png, *.jpg and *.gif. PNG and the older GIF are optimized for drawings, whereas *.jpg is optimized for photographies. Avoid using *.bmp, since these files are huge and will eat up your hard disk. Rather translate these to lossless PNG. Stitch Era allows to do some image manipulation. In particular, it includes a nice color reduction tool. You also may consider installing a simple image conversion/manipulation tool like IrfanView if you don't own or master the more difficult free Gimp or the commercial Photoshop software. For very simple operations, Windows Office Picture Manager also does a fine job. In the program menu, look in Microsoft Office->Microsoft Office Tools.

Digitizing bitmap drawings

LAMS (Learning Activity Management System)mascot, original GIF file

Digitizing bitmaps (raster images) may be a bit more difficult than converting vector graphics to stitches and for at least two reasons:

  • Usually bitmaps include too many colors (photographs always do). As you shall see, even a pretty simple drawing may include over 20 colors.
  • Lines are not clearly drawn and must be guessed by the vectorizing module.
  • Speckles (i.e. small shapes) can be found and will have to be reduced.

As example, we shall use a drawing that is the mascot of the LAMS (Learning Activity Management System) software. The original vector image isn't available anymore and we therefore had to start from a somewhat fuzzy raster image, i.e. a 32KB *.gif file, that you see to the right and that you can enlarge.

In addition, with respect to what we explained in Stitch Era - creating embroidery from vector images, we also introduce some additional auto-digitizing options, e.g. how to define stitch density and how to select a so-called fill pattern. Towards the end of this tutorial we shall discuss another simple example, i.e. the Moodle logo.

Loading a bitmap

Procedure:

  • Go to the Artwork tab
  • Click on "Open Image" and select the image file (*.gif, *.jpg, *.png, etc.)
  • Select the image by clicking on it (you may have to do this again !!)
  • Resize the image by dragging a corner (you also could do this later, once it is vectorized)
  • Crop the image if needed by clicking "crop image" button in the Edition panel on top left. I.e. you then can reduce useless margins on top, bottom, left and right by dragging the mouse over the area you want to keep. Hit CTRL-Z to restart.
  • In both cases, make sure that you can see the whole picture by zooming in or out.

Reduce colors

We now suggest reducing the number of colors since a typical consumer machine only can stitch one color at at time and you will have to change the threads each time the color changes. A semi-professional machine can do between 6 and 10 colors without changing threads and professional machine between 16. Even a very simple child's drawing made with 4 different pens may in reality have a few dozens. In the following screenshot were we reduced a drawing to 32 colors, you can identify six or seven variants of yellow. To stitch this, one yellow would be enough !

Fichier:Stitch-era-17-bitmap-color-reduction.png
Over 32 colors in a drawing made with 5 colors !

As explained in the Stitch Era - stitching children's drawings tutorial, six colors (yellow, blue, red, green, black and white) would be a good solution. Now let's move back to our LAMS mascot.