I am trying to read in the JPEG table from a TIFF file to locate sub-images in the TIFF file. (This is coming from a whole slide image svs file and I am trying to delete the label and macro image.) The JPEG table is hex encoded and I can't figure out to turn it to readable information to locate the sub-images.
I have tried unpacking the values. I don't want to save the file and open in Linux. I want to do this from within a jupyter notebook. I've tried for a while using "unpack" from IO core tools which didn't work. I also briefly tried BeautifulSoup, but it tells me that there is an invalid start byte. Here's the first line I am trying to decode:
b'\xff\xd8\xff\xdb\x00C\x00'
This line should return something like "JPEG image file..." I think if I can translate this line I can do the rest of this JPEG table.
Used a python TIFF package to help find the pages of the TIFF file I was looking for.
Related
I have a line of code that alters text
temperature<-as.numeric(gsub("°.*","",temp))
R does not like the "°" character. When I save the file it says I need to use a different encoding.
I have tried all sorts of different encodings from the list, but they all save the code in some variation of
temperature<-as.numeric(gsub("??.*","",temp))
My current solution is to open the script in notepad and copy paste the code into rstudio. Which encoding do I need to save a ° in rstudio?
The full solution to this in rstudio was to go to file -> save with encoding -> select ISO-8859-1 -> check the box Set as default encoding for source files. Now the file opens properly with the degree character every time.
I read my hyperspectral (.raw) file and combine three bands to "gai_out_r" Then I output as following:
writeRaster(gai_out_r,filepath,format="GTiff")
finally I got gai_out_r.tif
But, why Win10 can't display this small tif as the pic that I output the same way from envi--save image as--tif
Two tiffs are displayed by Win10 as following:
Default windows image viewing applications doesn't support Hyperspectral Images-since you are just reading and combining 3 bands from your .raw file, the resulting image will be a hyperspectral image.You need to have separate dedicated softwares to view hypercubes or can view it using spectral-python also.
In sPy, using envi.save_image , will save it as a ENVI type file only. To save it as an rgb image file(readable in windows OS) we need to use other methods.
You are using writeRaster to write to a GTiff (GeoTiff) format file. To write to a standard tif file you can use the tiff method. With writeRaster you could also write to a PNG instead
writeRaster(gai_out_r, "gai.png")
Cause of the issue:
I had a similar issue and recognised that the exported .tif files had a different bit depth than .tif images I could open. The images could not be displayed using common applications, although they were not broken and I could open them in R or QGIS. Hence, the values were coded in a way Windows would not expect.
When you type ?writeRaster() you will find that there are various options when it comes to saving a .tif (or other format) using the raster::writeRaster() function. Click on the links therein to get to the dataType {raster} help site and you'll find there are various integer types to choose from.
Solution (write a Windows-readable GeoTIFF):
I set the following options to make the resulting .tif file readable (note the datatype option):
writeRaster(raster, filename = "/path/to/your/output.tif",
format = "GTiff", datatype = "INT1U")
Note:
I realised your post is from 2 and a half years ago... Anyways, may this answer help others who encounter this problem.
I want to open a .jl file and convert it to a readable file preferably in .xls format.
I do not have any any idea about Julia language.
Is there a file opener for jl files?
I came here with the same question, but since the file I was looking at was clearly JSON data, I did some more searching.
The .jl file extension also refers to JSON lines, sometimes instead a .jsonl extension.
More here: http://jsonlines.org/
You can search for .json to Excel to find a converter, e.g. https://json-csv.com/ (this worked fine on my JSON lines file).
A .jl file is a julia script.
It is source code.
Not data.
You can open it up in any text editor, e.g. notepad on windows.
However, it won't normally contain anything useful to you unless you want to edit that code.
(It might contain some array literals that you want, I guess)
Perhaps you mean to ask "How can I open a .jld file"?
Which is a julia HDF5 file.
In which case please ask another question.
As I see, Julia is a script language therefor the file can be opened in a text editor like Notepad++, Vim, etc. Do not use word processor (like LibreOffice Writer) if you want to modify it, but it's OK if you want to read only.
To get started:
https://docs.julialang.org/en/stable/
I am referring to " https://github.com/keensoft/alfresco-simple-ocr" to perform OCR on tiff and jpeg files but is saying "Couldn't find trailer dictionary","Couldn't read xref table"," exception Failure("Error: pdfinfo could not determine number of pages. Check the pdf input file.\n")" although the transformation from jpeg or tiff files to PDF files is working properly and the PDF file is visible on the alfresco share page" but no OCR is working on those tiff and jpeg files
Basically there are many tools which are used for performing the OCR on pdf files.It depends on the tool as well.There is one bug in alfresco.It is an library issue.Below are details of that.
Create file called transformation.sh and before adding your command in it you have to add below line in it.If you are using windows you need to create batch file accordingly.
unset LD_LIBRARY_PATH
If you are not setting above in the script file you will face an error while conversation.You can find that bug details on below link of alfresco.Its registered issue in alfresco.
https://issues.alfresco.com/jira/browse/ALF-19946
PDF to PDF conversation are very well explained in below link.
http://www.krutikjayswal.com/2016/07/ocr-on-pdf-file-in-alfresco.html
You might need to change the source code for tiff conversation.
My setup: Eclipse, R and Statet
I am using R from inside Eclipse using Statet.
I have made a graph (this is the plot of a time series, in case this is relevant information).
I now wish to save this graph as a JPG image (or BMP, or the like ...), or to copy this image in the clipboard. I need my graph in a PowerPoint presentation.
Does anyone know how to do that?
Thank you
jpeg('foo.png') more help is available by typing ?jpeg at the statet prompt. You may also be able to write to the clipboard, using a destination of clipboard instead of the filename, depending on your platform -- see ?connections for further details.