On 9/6/07, Ross Presser <[EMAIL PROTECTED]> wrote: > You said you "exported from the djvu viewer with ascii", but your > commandline shows PPM? I'm not understanding. > > When you say your ultimate goal is to get a pdf, do you mean a pdf with text > as text, where the text can be copied to the clipboard? That is going to > require an OCR step, with a Spanish-aware OCR program. > > Put up your PPM for download somewhere. (Zip it this time!)
My raw (without ascii) PPM is available at http://rapidshare.com/files/53847538/example.zip (The ZIP file is 2,4 MB large.) Yes, I would like to add text to be copied from the pdf to the clipboard. If one has a text file with the text of the document, is it possible to mix it with the image in the pdf file such that one can copy from the pdf file to the clipboard? Paul > On 9/6/07, Paul Smith <[EMAIL PROTECTED]> wrote: > > On 9/6/07, Ross Presser <[EMAIL PROTECTED] > wrote: > > > I used the Any2DjVu Server at > > > > > > http://any2djvu.djvuzone.org/any2djvu.php > > > > > > to convert this 18Mb full color TIFF to a 38 kilobyte DJVU file. (By > the > > > way, why did you save it with no compression? ZIP compression reduced > the > > > original from 18mb to 15.5 mb ... not much, but a little savings.) > > > > > > http://rpresser.googlepages.com/example.djvu (38k) > > > > > > There are a number of different freely available DJVU readers; Google is > > > your friend here. > > > > > > When it is initially viewed as a DJVU file, it appears exactly the same > as > > > the color TIFF. But the View menu allows you to see only the black and > white > > > layer, suppressing the color background. (It also suppresses the color > > > photographs.) Now the black text is easily readable on a white > background. > > > > > > Viewing only the color layer, we can see the color photos are still > there, > > > as well as some soft residue from the text. > > > > > > I wasn't able to easily find a way to export only the b/w layer using > the > > > viewer I have. But I was able to select it and copy it to the clipboard, > > > then paste it into a new grayscale graphic (in another graphic editor) > and > > > save that. (It claimed to be 3 unique colors, therefore grayscale > rather > > > than true black and white.) The result is here: > > > > > > http://rpresser.googlepages.com/example-bw.tif > (79k) > > > > > > Note the incredible efficiency of DJVU here. The entire layered DJVU > file, > > > with all the color information and appearing identical to the original > when > > > viewed, is half the size of JUST THE TEXT, even when compressed using G4 > > > compression -- one of the best available for bw images. > > > > > > The final step in this work, if desired, would be to extract the color > > > photos from the color layer, clean them up, and paste them back into the > b/w > > > layer. > > > > > > Thanks, Ross, for your help. It is quite impressive impressive the > > amount of size reduction that you achieved! > > > > My ultimate goal is to get a pdf from the scanned document. I exported > > from the djvu viewer with ascii and then I used the command > > > > $ convert -monochrome -compress Group4 example.ppm example.pdf > > Segmentation fault > > $ > > > > getting always a "Segmentation fault". Any ideasto overcome the > > "Segmentation fault"? > > > > Paul > > > > > > > > > On 8/30/07, Paul Smith < [EMAIL PROTECTED]> wrote: > > > > On 8/30/07, Ross Presser < [EMAIL PROTECTED]> wrote: > > > > > The best solution to this problem may be in the domain of JPEG2000 / > > > djvu > > > > > image segmentation algorithms. Look up some scanned books on > > > archive.org, > > > > > particularly in djvu format. The djvu plugin lets you suppress the > > > > > background completely ... so identifying what is "background" is > part of > > > the > > > > > djvu construction. > > > > > > > > Thanks, Ross and Anthony. My figure is available at: > > > > > > > > http://rapidshare.com/files/52236170/example.tif.html > > > > > > > > (Note please that the file has the size of 18MB.) > > > > > > > > Paul > > > > > > > > > > > > > > > > > > > > > On 8/29/07, Paul Smith <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > > Dear All, > > > > > > > > > > > > I have got a colored scanned TIFF image from a newspaper article. > Can > > > > > > ImageMagick be used to convert the color of the image background > to > > > > > > white, with no loss? > > > > > > > > > > > > Thanks in advance, > > > > > > > > > > > > Paul > > > > > > _______________________________________________ > > > > > > Magick-users mailing list > > > > > > [email protected] > > > > > > > > > > > > > > > http://studio.imagemagick.org/mailman/listinfo/magick-users > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Magick-users mailing list > > > > [email protected] > > > > > > > > http://studio.imagemagick.org/mailman/listinfo/magick-users > > > > > > > > > > > > _______________________________________________ > > Magick-users mailing list > > [email protected] > > > http://studio.imagemagick.org/mailman/listinfo/magick-users > > > > _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
