I am trying to batch process images, in which I need to convert some multi-page tiff files to individual jpeg images, I tried with PIL library of Python but sadly PIL only supports conversion of a single page, in this case the first page in TIFF files.
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enter image description here
I have a PIL image in python as shown and I want to extract each of the small red regions separately into a jpeg format. So from this file, I'm expecting file1.jpg, file2.jpg, etc.
How can I obtain each sub-regions in each different file?
PIL doesn't really excel at that. I would consider using:
OpenCV findContours(), or
scikit-image regionprops(), or
ImageMagick Connected Components, or
Python wand bindings to ImageMagick as above
I have a situation where I need to convert TIFF files to JPEG files in Python. I am using the PIL library to do this and it works fine unless the TIFF has a transparent background on it and then PIL can't open the file and says it is not recognized. Are there other solutions to this in Python?
TIFF format files usually consist of multiple images of different resolutions. Try reading with openslide
Eg:
patch = openslide.OpenSlide(img_path)
patch = patch.read_region((17800,19500), 0, (256, 256))
For more info visit openslide documentation
I have tried pdf2image and PIL to convert pdf to tiff image
when i convert pdf to tiff image for each pdf page generate new tiff image.
I want to single tiff image instead of different one.
Background
I am using Tesseract-OCR 3.04 on a Linux setup to batch OCR process for a bunch of non-searchable PDFs.
My process is such that I take the PDF, convert it to a tiff format, then using Tesseract, I convert that tiff into a searchable pdf format.
The issue
The output from the Tesseract 3.04 tiff to pdf conversion always produces a pdf with a blue background. I have checked and the tiff file has a white background.
Here is the output I am getting. Obviously mostly-censored for privacy.
What I have tried
I have created by own "untouched" tiff file with a white background and ran it through Tesseract to a pdf output and the blue background persists. I did this by typing paragraphs of text into my text editor, screenshotting it, and converting it to tiff.
I have had absolutely no results in google searching my issue.
--
I do not know what the issue is within the Tesseract process, does anyone have any information that could help?
Thanks!
How to flatten images in PDF files with transparency?
convert PDF to PS (postscript)
pdftops input.pdf output.pdf.ps
If a PDF file contains eg. PNG files with alpha channel (transparency) the PDF is rendered/rasterized to an image and that is not a solution because then you lose the plain text in the file
Is there a tool (linux command line) to flatten images in PDF files with transparency?
Its not clear why you want to do this. If you want PostScript then Ghostscript can produce PostScript for you from a PDF file (use the ps2write device). Obviously transparency will have to be rendered to an image, in which case the resolution is important. The default is 720 dpi which is probably higher than you might need.
Note that a PDF file can't contain a PNG, that's not a possible image type in PDF. A PNG would have to be stored as an image with a separate alpha.