Convert from tiff to other multipage format - plsql

I am looking for a way to convert tif files into pdf or image format with multiple files using plsql. What I need to achieve is displaying converted pdf (or other format) with multiple pages from tif file and show it in browser.
What I did so far was to convert from tif to png but since png it's single file it's not what i'm looking for .
ordsys.ordimage.process(dest_loc, 'fileFormat=PNG');
ordsys.ordimage.getproperties(dest_loc, v_clob);
Chrome and Firefox doesn't support TIFF format anymore.
Or any other idea it's great. Thank you!

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Downloading images of a specific format using bing-image-downloader

Is there a way to download only jpg or png or another specific format images using bing-image-downloader in python?
This is the documented code for using bing-image-downloader...
downloader.download(query_string, limit=100, output_dir='dataset', adult_filter_off=True, force_replace=False, timeout=60, verbose=True)
Is there something that can be added to this to, let's say, only download .jpg images from the web?

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We are downloaded map.mbtiles from openmaptiles.com.
Now we are tyring to convert that map.mbtiles to png images.
We tried mbutil to convert but images we got those are not supported.
We need method or process to convert it.
The easiest way would be using the Tileserver-GL to render png raster tiles from your mbtiles. Documentation is avaible here: https://tileserver.readthedocs.io/en/latest/

Convert hex code from TIFF to readable format

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.

Why does R raster::writeRaster() generate a pic which can't be shown in Win10?

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.

How to pull out each slide of a powerpoint and convert them to .png

I'm trying to write a C program that converts each slide of a powerpoint presentation to .png files. I have tried unoconv but the problem is that it only converts the first slide. Is there any way to iterate through the .ppt and convert each slide to a .png?
What I have usually done is print the PPT using Windows to a virtual printer that emits to PDF or PostScript. From there, one can then convert to PNG — for example using GhostScript — if desired.

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