This PNG image is in base64:
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGYAAAAZBAMAAAAxhUZFAAAAG1BMVEXz8/MzMzPDw8NjY2N7e3urq6tLS0vb29uTk5O9wJ50AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABOElEQVQ4je1SsW6DMBQ8Y8CMttoPIEo+ALNkpZWSrCxVM6IKKasroswMlcpn9/nZSEkqlnbNSUaGd/fu/AzwwF+RVFhBmgPttCwBte+dsr0zxvhyDmGMhn12zAkgnsUXJtpp0kO2WZW35wZ482VLK2uLphiZE7BG8oItBmCjUQMC0PAraXzHT3psIJ2qmBOwg1yhowyoNfmxDyXsiOeTUwvqSNWOOQE1BkFdBVSlyRTKGCJnI45cFrz35p4TofEaNGmpfSc5FhSKYpxmTe5+aVQnONuFlfE8Bz9PYfh1jftsJ0mz9OezNNxLKOPskLazzw73M+BRTe7IMall+l40yZa05az5AIrvbAwcxuS/D6Zijb+BfY+crGP4EFXZp8iJ93OFeulvuUXMwEiqRdoNrnmyXKQ98E/8ADIIKtlalug3AAAAAElFTkSuQmCC
Is it possible to decode to get the text from it without using OCR technology?
The base64 code above will result in the following PNG image:
Definitely not.
What you have is a base64 encoded PNG file. PNG files are binary files containing compressed pixel data, not text characters.
OCR would be the only way to try to recognize the characters in the pixel data.
Related
Inside of the file has a bunch of these types of encodings.
I have no idea how this file was encrypted so trying to figure out what program this may be from.
{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf830
{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\froman\fcharset0 Times-Roman;}
{\colortbl;\red255\green255\blue255;\red0\green0\blue0;\red0\green0\blue0;}
This is Rich Text Format (RTF).
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.
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!
I was told once that code is faster to download than image files. Is this true, or is file size the only factor that matters?
For example, I have an SVG file that is a complex illustration. This SVG file is 3.5mb, after optimization using SVGOMG.
I also rendered the illustration as a PNG file. The PNG version has file size of only 153k, after optimization using ImageOptim.
In this scenario, is it true that an SVG file download is faster because it is code - as opposed to a bitmap? OR is the file size the only factor that determines download speed?
The reason I am considering SVG is to preserve the detail of the illustration.
I am using Qt and saving a image file out of a QML UI item. Following is what I do
auto screenshot = quick_item->grabToImage();
screenshot->saveToFile("/somepath/filename.jpeg");
// OR sometimes use like png like
screenshot->saveToFile("/somepath/filename.png");
This is works fantastically well on all platforms. I open the file the image is saved as intended.
Now my question is:
I just mentioned .jpeg as file extension while providing the filename as param into saveToFile. This works but, should I need to use QImageWriter to ensure that the image is actually compressed in jpeg/png format ?
What happens when it is a lossy compression like jpeg?
How to control a lossy compression if I want to like in android I can do a image.compress(CompressFormat.JPEG, 80, stream) where 80 is the percentage of quality for Compress ?
You can't do that directly from QQuickItemGrabResult, you have to use QImage::save() for that :
auto screenshot = quick_item->grabToImage();
auto image = screenshot->image();
image.save("/somepath/filename.jpeg", nullptr, 80);
The second parameter of save is the format, but it can be left null and then be guessed based on the filename extension, the third one is the compression quality.
The quality factor has no effect if you use a lossless format like png. You can set it at -1 (the default value), omit the parameter or use a factor that you would use for lossy format.
EDIT: as pointed by #Arsenal, the quality factor maps to compression levels for lossless formats (those that support it). For example in PNG, quality 0 maps to PNG compression level 9 (smallest file size) and 100 to PNG compression level 0 (biggest file size). The default quality for PNG in Qt is 50, mapping to a PNG compression level of 4.