Imagemagick antialias text

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I want to convert SVG images to PNG files with transparent background and anti-aliased edges using semi-transparent pixels.

Image Processing (ImageMagick)

Unfortunately I can't get ImageMagick to do the anti-aliasing, the edges always look terrible. Here's what I tried:. As a side note, I found that getting transparency was a bit tricky. Instead of using transparentI had to use none. By default, objects e.

This will then reduce the number of colors added to an image to just the colors being directly drawn. The way I learned how to do this was from the methodology found here: How to convert a.

It is the same idea as halfer's solution with inkscape --to jack up the DPI first--but you can accomplish the same thing in just imagemagick using the -density option. Adding the -transparent white option solves the problem particularly in my case because background isn't removed completely unfortunately light shadow is present. I add a rect as background. The embed CSS hide the background. Then I catch its color for setting the transparent attribute of ImageMagick.

I get better, already nicely antialiased results if I replace -resize with -scale. Then, the antialias flag isn't even necessary. Learn more.It is also one of the most simplest, but with scope for some very fancy results.

As such this is a good place to start our exploration of IM's capabilities.

Multipule Images into 1 with ImageMagick - BASH - Linux

Text Operators in ImageMagick ImageMagick has a lot of different ways in which you can draw text within an image, highlighting the versatility of the image processing library. This page details specific methods and styles of drawing text.

ImageMagick

What you have to keep in mind as you study these examples is that ImageMagick is primarily a image converter and modifier. As such each of methods provided are simple text drawing operators, such as adding labels and copyright messages to images. See Annotating Images. All the text operators also understand and use a set of standard text processing settings such as, the " -font ", " -pointsize " to use. Also the " -fill " color setting and for more complex text drawing the " -strokewidth ", " -stroke " and " -undercolor " colors.

In cases where you actually create a new image, such as label and captions, the " -background " color setting is also used. And finally the newer " -kerning " and " -interword-spacing " modifiers.

What ImageMagick is notis a full formatted text and document processor. If you want heavy text processing, you are better off using a full interactive word-processor, or batch text formatter like " TeX " or or one of its flavors see A Complete Text Processing System below.

The output of these programs generally postscript format can then be converted into an image and further modified by ImageMagick. That is, use the right tool for the right job. That said some mixed font handling can be done.

imagemagick antialias text

Now, lets now look at the basic ways you can convert text into images. Later in the next section Compound Fonts we'll look at generating some interesting font effects.

Label - Simple Text Label Basic Labels Creating a font image using a " label: " image, is the more typical way of drawing a font quickly in ImageMagick. The biggest advantage is that generates its own canvas according the current " -background " and " -fill " color settings, which is sized to match the drawn text. For example here is a typical generated label. Under Construction. ImageMagick Examples Preface and Index. The ' label: ' image generated will also have the ' label ' Image Property meta-data set to the same string.

For and example of using 'label' meta-data, see Montage using Saved Meta-Data for examples. Before version 6. This causes the text in the above images to be auto-sized according to the 'best fit' handling see next set of examples.

When IM creates a 'bestfit' label, the actual pointsize it used is also saved into the ' label:pointsize ' Image Propertyallowing you you use that information later. This was added to IM v6. Most older versions of IM before v6. In these versions the lines would have been appended together to form a single, very very long line. The ' caption: ' image generated will also have the " caption " Image Property meta-data 'set' to the same string, allowing you to re-use that information later.

All the common image file formats will save this information with the image. See Montage using Saved Meta-Data for examples. And now a much smaller thinner area, for the same font and text string. There is no 'justified' text option to caption. But the pango: text formatter using an external librarydoes have that feature, and a lot more. At this time, you can not use tiling images defined using " -tile ", " -fill ", " -background ", and " -origin ", with either " label: " or " caption: ".

Only solid colors can be used.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. If I reduce stroke from 10 to 4then it's OK, but the line is not visible enough I need thicker line :. If I increase the image resolution, then I need to make bigger stroke and in the end the result is the same. How can I achieve a nice antialiased line, which is also thick? Based on emcconville's comment, I was able to fix this by using polyline to draw the line instead of many line calls.

Learn more. Asked 11 months ago. Active 11 months ago. Viewed 76 times. Don't add setStrokeColor and setStrokeWidth. That just makes it wider. Just use setFillColor. Stroked outlines are antialiased by default, so remove setStrokeAntialias.

Will try if this removes the jagged edges. If you really want thick lines, then you will need the setStrokeColor and setStrokeWidth. But try removing the setStrokeAntialias, since it is on by default. Polyline would be better as less work. What happens if you remove the shadow under and around the lines?

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imagemagick antialias text

Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Triage needs to be fixed urgently, and users need to be notified upon….Below is list of command-line options recognized by the ImageMagick command-line tools.

If you want a description of a particular option, click on the option name in the navigation bar above and you will go right to it. Unless otherwise noted, each option is recognized by the commands: convert and mogrify. A Gaussian operator of the given radius and standard deviation sigma is used. If sigma is not given it defaults to 1. See Image Geometry for complete details about the geometry argument. The -adaptive-resize option defaults to data-dependent triangulation.

Use the -filter to choose a different resampling algorithm. Offsets, if present in the geometry string, are ignored, and the -gravity option has no effect. This option is enabled by default. An attempt is made to save all images of an image sequence into the given output file.

However, some formats, such as JPEG and PNG, do not support more than one image per file, and in that case ImageMagick is forced to write each image as a separate file. As such, if more than one image needs to be written, the filename given is modified by adding a -scene number before the suffix, in order to make distinct names for each image.

As an example, the command. In summary, ImageMagick tries to write all images to one file, but will save to multiple files, if any of the following conditions exist Set the drawing transformation matrix for combined rotating and scaling.

This option sets a transformation matrix, for use by subsequent -draw or -transform options. The matrix entries are entered as comma-separated numeric values either in quotes or without spaces. Internally, the transformation matrix has 3x3 elements, but three of them are omitted from the input because they are constant. The new transformed coordinates x'y' of a pixel at position xy in the original image are calculated using the following matrix equation.

The size of the resulting image is that of the smallest rectangle that contains the transformed source image. The parameters t x and t y subsequently shift the image pixels so that those that are moved out of the image area are cut off.Convert, Edit, or Compose Bitmap Images Consider posting your issue or question on our new discussion forum.

Privacy Terms. Skip to content. Quick links. Text antialiasing, poor file conversion Questions and postings pertaining to the usage of ImageMagick regardless of the interface. Usage questions are like "How do I use ImageMagick to create drop shadows? See link below. Use a blur perhaps? The text quality is visibly poor in the resulting file, see "imagick" folder above.

ImageMagick 6. I've been working with this project since the start of the year and have progressed quite a way with converting between postscript-type files, namely PDFs. I've noticed however that there are significant differences in the rendering of text compared to images.

Images render fine, texts degrade much quicker at lower densities. I'm aware that the rasterization takes place which is where the problem fundamentally lies, however is there anything more that can be done to make it more smooth for text when being processed?

I've noticed particularly at lower densities eg. Any help would be appreciated. Ghostscript makes the rasterization. You can change the handling of the elements that are antialiased. But some things are simply not antialiased at all with Ghostscript.

I think that normal fonts are antialiased. But other vector graphics are not - or not always? I've been looking for an alternative to manage the vector files and haven't come across anything suitable, GIMP on the command line was all that I came across. But the jagged edges of the text will be gone.

If you have problems with specific PDFs, you could upload an example. Rasterization is an issue however not at low density due to PDFs being for email delivery. Anyway, this method is mainly for vectorial elements that can be rasterized at a higher density and then get downsized and the downsizing does some sort of antialiasing. But this last PDF is solely made out of images already rasterized, stored with a simple RLE compression - with no vectorial text at all.

The best thing you can do with such a PDF is to just 'rasterize' it again with the source density dpi in your case. You could probably test some things to reduce the jagged edges blurring or something like thatbut personally, I would stay with the unmodified source images. If you resize the dpi images to a lower resolution, the jagginess will also be a bit reduced of course.Convert, Edit, or Compose Bitmap Images Consider posting your issue or question on our new discussion forum. Privacy Terms.

Skip to content. Quick links. Usage questions are like "How do I use ImageMagick to create drop shadows? What's the best command line option for converting a text file to a TIF? I have this So maybe I'm doing something wrong here?

imagemagick antialias text

The text file should all fit on one page any resizing option I can use to always ensure it does? Nothing special in it. I just want the TIFF file to be the text itself with no fancy effects. I'd love it if there were some options that could also make sure the resulting TIF file was very readable.

You may like to look for some other Fixed Width font.

Image Processing (ImageMagick)

Before that I was also getting an error message on Windows Picture and Fax Viewer that said the picture was unreadable but using -monochrome fixed that and the problem with the half blurry page. I appreciate the answer! How do I take multiple text files and convert them all to tif as separate pages?

You can do this: convert textfile1. But of course there will be no styling, coloring, pointsize, etc. Is this what you want? Depends upon what you want to do. You can also use caption:, -draw, -annotate.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up. I'm getting surprising to me variations in antialiasing quality when converting a PDF with black text on white only to a PNG and removing transparency with ImageMagick version 6.

There's some anti-aliasing, but not very good, and some lines such as the horizontal stroked on the e have completely disappeared. At higher resolutions, the rendering is still clearly poor, but at least the lines start to appear.

It is like when background is white, ImageMagick detects that there are only two colors — black and white — and switches to a grayscale mode of PNG, hence the ugly result:. So now, how to prevent using the grayscale mode of PNG? Here it is:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Alpha removal with ImageMagick is bad but only with a white background Ask Question.

Asked 4 years, 7 months ago. Active 4 years, 7 months ago. Viewed 3k times. Choosing any color other than white produces a decent result. If I set this up as part of an automated process where someone won't be around to visually inspect the result, what parameters do I need to avoid to get good results?

Gilles 'SO- stop being evil' Gilles 'SO- stop being evil' k gold badges silver badges bronze badges. That's a good question for the ImageMagick mailing list, which was once very active - but there is a forum now: imagemagick.

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Active Oldest Votes. Here it is: convert -density -alpha remove -alpha off a. Gilles 'SO- stop being evil' k gold badges silver badges bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Cryptocurrency-Based Life Forms. Q2 Community Roadmap. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….

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imagemagick antialias text

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