Legacy ImageMagick Discussions Archive

cancerberosgx For converting shapes to vectors, you may like to look at IM Examples... http://www.imagemagick.org/Usage//draw/#svg_output Where I go though the process, using autotrace. however SVG is not really suitable for 'drawing' real photos. I have now added a link from that area to your post ...

Yes it was added to IM Examples all those years ago...

PbmPlus / NetPBM Image File Format: PBM PGM PPM PNM PAM
http://www.imagemagick.org/Usage/formats/#pbmplus

Image Density or Resolution http://www.imagemagick.org/Usage/basics/#density The density of an image is completely irrelevant to the actual images pixel size. It is just a set of numbers stored with the image to tell output devices such as printers and displays how many dots (or pixels) per inch the ...

For UNIX I would use single quotes. Otherwise '\' in '\n' may get removed, though as the shell did not understand '\n' it probably didn't remove it. In shell (and more (non-DOS) languages), single quotes means 'literal' or don't do anything... While double quotes means handle '$' variable ...

I have removed (HTML Commented) the define from IM Examples. It will update, during normal distribution.

What would you like the documentation to say? ;-) It is a little confusing as to what exactly the option does. It sounds like the setting is 'true' by default. Does setting it to 'false' disable the preservation? Or does the option just not do anything at all? :-? Or should I just mention those ...

Yes that was added later. Defaults when numbers not given being the images virtual canvas size. Though that default for image area selection is more commonly used for -crop rather than -scale. When percentages are involved the default is a copy of the other percentage, that was -crop 50% or -scale ...

The main thing to keep in mind when in merging commands is that sometimes after setting some setting, you will need to unset or reset them, in case that setting effects a later step. For example you start with a " -gravity center " later you do this again, when it is not needed as that setting would ...

Unless the picture you want to frame fits in to your 'leafy image nicely... You may want to break up leafy into sub pictures, and then add them around your picture. Something like the "picture frame" process in http://www.imagemagick.org/Usage/thumbnails/#frame_edge It all depends on exactly what ...

If the image is from a screen dump... Make the image BIGGER.... tesseract is designed for scanned documents at about 600dpi, but displays are typically only 90 to 100dpi so scaling by 600% often works wonders. I also find some fonts make go bad. For example a 'serif f' will often be thought of as a ...

Also how 'fuzzy' and 'shaped' the border is between background and foreground. For example rotated square images? Or other odd shapes. What other 'junk' is on the page... Text? It is all a matter of defining what is foreground and background in a way the computer can understand. The trouble with ...

PDF Raster Image Extraction
http://www.imagemagick.org/Usage/formats/#pdf_images

Compare it with a white image, and generate a mask, with anti-aliased transparent edges... See http://www.imagemagick.org/Usage/masking/#semi-trans Though it is simpler as the background is just white. Basically work out what IS fully-opaque (foreground), and you know what is fully-transparent ...

Getting full lines and spaces requires careful quoting. You need to read, not concatenate into a work list. Note the use of "$line" in the loop.. while read line; do convert canvas.jpg \ \( -size 100x100 -background white -font arial.ttf \ -fill black label:"$line" -trim +repage -depth 8 ...

A Number of ways... Here are two... Using Masks with Images http://www.imagemagick.org/Usage/masking/#masks Composing using Duff-Porter methods, Specifically with Dst-Out http://www.imagemagick.org/Usage/compose/#dstout But essentially you want to manipulate the images alpha channel, either directly ...