See also figures L. It draws two identical sets of objects over the same image and sets the current alpha state, so that we'll have:. Note that rectangles on the left, which were included into the transparency group, were treated as a whole transparent thing, while rectangles on the right were treated as separate transparent objects. This sample demonstrates one of the possible applications of transparency groups.
Using images it's possible to create a stencil mask using raster data as a source for mask values and draw through it with current non-stroking color or apply an explicit mask to achieve the same effect but for the image itself. But stencil masks are quite limited in terms of defining transparency. You can only indicate whether the particular location within the mask is fully transparent or not, making it impossible to define a mask containing semi-transparent areas.
Soft masks, discussed here, are designed for complex masking effects which are impossible to achieve with any other type of masking. The word "soft" emphasizes that the mask value at a given point is not limited to just 0.
Such a mask is typically the only means of providing position-dependent opacity values, since elementary objects do not have the any intrinsic properties specifying opacity. It is fully described in section TransparencyGroup is special kind of a form XObject which is being discussed above Transparency Group XObjects and, among other things, can provide soft mask values derived either from its alpha or luminosity calculated for any given point.
It implements ClippedContent and therefore can contain the same drawing commands as other descendants like Page for example. To apply a SoftMask while drawing, one have to create a GraphicsState object and apply it by calling the SetGraphicsState function on the desired ClippedContent instance before any further drawing occurs. Consider the following code that draws two rectangles. The red one on the left is drawn without any masking and the blue rectangle on the right using the circle-shaped soft mask.
Luminosity values are used to derive soft mask from the transparency group containing the drawn circle. As artwork becomes more complex mixing images, vectors, type, spot colors, overprinting, and so on , so does the flattening and its results.
You can specify flattening settings and then save and apply them as transparency flattener presets. Transparent objects are flattened according to the settings in the selected flattener preset. Use the preview options in the Flattener Preview dialog box to highlight the areas and objects that are transparent, as well as those affected by transparency flattening. Transparent content is highlighted in red, and the rest of the artwork appears in grayscale.
Use this information to adjust the flattener options before you apply the settings, and then save them as flattener presets. You can then apply these presets from other dialog boxes. Use the preview options in the Flattener Preview to highlight areas that are affected by flattening. You can use this color-coded information to adjust flattening options.
The Flattener Preview is not intended for precise previewing of spot colors, overprints, and blending modes. Instead, use Overprint Preview mode for those purposes. In Illustrator and Acrobat, to magnify the preview, click in the preview area. To pan the preview, hold down the spacebar and drag in the preview area. You can set Transparency Flattener options when creating, editing, or previewing flattener presets in Illustrator, InDesign, or Acrobat.
None Color Preview. Rasterized Complex Regions. Keep in mind that the boundary of the highlight area has a higher probability of producing stitching problems depending on the print-driver settings and the rasterization resolution.
To minimize stitching problems, select Clip Complex Regions. Transparent Objects. Highlights the objects that are sources of transparency, such as objects with partial opacity including images with alpha channels , objects with blending modes, and objects with opacity masks.
In addition, note that styles and effects may contain transparency, and overprinted objects may be treated as sources of transparency if they are involved in transparency or if the overprint needs to be flattened. All Affected Objects. Highlights all objects that are involved in transparency, including transparent objects and objects that are overlapped by transparent objects.
The highlighted objects will be affected by the flattening process—their strokes or patterns will be expanded, portions of them may get rasterized, and so on. Affected Graphics InDesign only. Highlights all placed content affected by transparency or transparency effects. This option is useful for service providers who need to see graphics that require attention to print properly. Expanded Patterns Illustrator and Acrobat. Outlined Strokes.
Highlights all strokes that will be outlined if involved in transparency or because Convert All Strokes To Outlines is selected. Outlined Text Illustrator and InDesign. Highlights all text that will be outlined if involved in transparency or because Convert All Text To Outlines is selected. In the final output, outlined strokes and text may appear slightly different from native ones, especially very thin strokes and very small text.
The All Rasterized Regions option also shows raster graphics such as Photoshop files involved in transparency, and raster effects such as drop shadows and feathers.
Note that this option takes longer to process than the others. Specifies the name of the preset. Depending on the dialog box, you can type a name in the Name text box or accept the default.
You can enter the name of an existing preset to edit that preset. Specifies the amount of vector information that will be preserved. Higher settings preserve more vector objects, while lower settings rasterize more vector objects; intermediate settings preserve simple areas in vector form and rasterize complex ones.
Select the lowest setting to rasterize all the artwork. The amount of rasterization that occurs depends on the complexity of the page and the types of overlapping objects. Line Art And Text Resolution. Rasterizes all objects, including images, vector artwork, text, and gradients, to the specified resolution. InDesign indicates this per spread, even if only one of the two pages contains transparency. In the example below page 2, page 3, or both pages contain transparency.
Adobe has produced an excellent though also meanwhile outdated white paper on the use of transparency in print production. Thanks and Best Regards, Omid Mansourbakht. Dont know if enything to do with here,but maybe somone can help- my file i made in iilistrater with an — low opacity eelement wont show up when i upload it in email.
Hi there, I have book scanned as pdf doc. There are lots of dots and smudge marks in the doc. Can you please guide me how to remove them so that I can get a clean copy for sending it to publishing house. Thanks [email protected]. That question does not have anything to do with transparency.
Anyway: I am not aware of any automated solutions that can do this. If you have Adobe Acrobat Professional and an image editing program, you can configure Acrobat to edit the scans embedded in your PDF using the image editing application.
Lots of work, but maybe part of cleaning up these scans can be done by filters or actions if you happen to use Photoshop. I have created drop shadows on a couple of standard rectangular objects.
When I create the PDF, the shadows are missing. So i have shown it by using the transperency optn in Autocad but when i convert it to PDF the transperency is not visible n it looks as a colored object….
That would be because you cannot. PDFs are treated like paper documents in acrobat reader and all the other readers I know of — it will not appear transparent unless you leave it as an editable pdf and open it in Photoshop. It will be transparent in photoshop, but will never appear transparent in acrobat reader.
The transparent background in the PDF is indeed marked using a checkerboard pattern. Thanks Tom! Thanks for the infos. Your email address will not be published. This effect can be used for a number of reasons: It makes underlying image objects shine through, so it is useful for emulating glass, fog, varnish but also shadow.
0コメント