829 questions
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Android - compressing photo returns all black bitmap on some devices
In my app I need to take a photo -> compress -> upload to BE.
Problem: photos from some exotic devices are all black after compression
To take a photo, I'm using a ActivityResultContracts....
- 488
-6
votes
2
answers
148
views
Why is flipping a PNG changing the quality of the image?
I have the following code:
System.Drawing.Image img1 = System.Drawing.Image.FromFile(imgPath);
System.Drawing.Image img2 = System.Drawing.Image.FromFile(imgPath);
img2.RotateFlip(RotateFlipType....
- 73
0
votes
1
answer
105
views
FlutterImageCompress: AssertionError - "The jpeg format name must end with jpg or jpeg"
I'm encountering an issue with the flutter_image_compress package when trying to compress images captured using the DeepAR package in my Flutter app. The process works fine on Android, but on iOS, I ...
- 33
0
votes
1
answer
82
views
OpenCV: Saving image files - Difference between cv.imwrite and f.write()?
I'm importing images from a security camera for image processing. After importing the image, I want to save the image for archiving (processing will happen on the fly).
I see two available methods for ...
- 13
2
votes
1
answer
177
views
Losing image resolution when converting PDF to image and back with PDFBox
I had a Java program written for me that would take a single page 36" high x 48" wide PDF file and would "slice" it into 3 single pages, 12x36, 24x36 and 12x36 of which I would ...
- 23
2
votes
1
answer
183
views
What's the best compression algorithm for sets of images that share conceptual similarities?
I want to compress several hundred images together into a single file. The images are all scans of Magic: The Gathering cards, which means they have large blocks of similar color and share many ...
- 394
0
votes
1
answer
199
views
Why ASTC texture format is not available in runtime?
The problem is that I cant create a Texture2D with RGBA_ASTC6X6_UNorm graphics format.
As I understand, ASTC is a special kind of compression, that could be used by GPU. In my application I can ...
- 1,201
0
votes
2
answers
166
views
How to compress the files on frontend in Livewire
I am using browser-image-compression library to compress the images before uploading. Now it gives the compressed Image and the compressed image is also stored in the storage folder.
But I want to ...
- 11
1
vote
0
answers
79
views
Compression results from EZW paper not reproducible?
I have been doing some research into the Embedded zerotrees of wavelets algorithm as a reference method for a journal. I found a couple of implementations of it in Matlab, python, and C and was able ...
- 33
0
votes
1
answer
119
views
How to convert BC7 to ASTC directly and fastly?
I have prepared-well BC7 tetxure, how to convert it to astc format (e.g., ASTC_12x12) directly? Not decompress BC7 -> compress ASTC, It's too slow.
Is there any algorithm or tool that can convert ...
- 301
1
vote
2
answers
407
views
Flutter resize and compress image in Isolate throws UnimplementedError
I am trying to resize and compress and image in an Isolate, because without that, the UI becomes janky. I tried it like this:
import 'dart:isolate';
import 'package:firebase_crashlytics/...
- 2,404
0
votes
2
answers
170
views
Visualize an image pixel buffer with a bit depth of 3 i.e. each pixel having 3 bits of data
Question
What are the tools/standards/file formats by which I can visualize my image pixel buffer on which each pixel has 3 bits?
My Language is Go.
PNG header
Bit depth: 3 vs 4
An image pixel buffer ...
- 8,185
0
votes
1
answer
100
views
Encoding ac and dc cofficients in jpeg compression after zigzag ordering
I'm trying to implement JPEG compression in python and so far I have done the following steps
Color Space conversion
Downscaling chrominance channels
8x8 block splitting ( adds padding if size is not ...
2
votes
0
answers
108
views
Convert JPG image into WSQ image compression using NBIS on iOS
I need to convert and compress fingerprint images to the WSQ (Wavelet Scalar Quantization) format. WSQForAndroid is online availabe code which is working fine on android but I'm having wrong output in ...
- 21
2
votes
0
answers
67
views
How to upload BC7 mipmaps less than 4x4 for D2Array?
I'm compressing images using the intel_tex_2 crate. I'm uploading using the wgpu crate. Texture format is Bc7RgbaUnorm. Everything works fine until I have more than 1 D2Array layer and less than 4x4 ...
