All Questions
35 questions
0
votes
0
answers
111
views
Extract black and white raw image in PDF to jpg and tiff
I have a task to extract black and white (1 bpc) image from PDF to jpg and tiff using .Net.
But I got an exception when creating a bitmap from the memory steam.
The below is parts of my code
...
- 1
1
vote
1
answer
928
views
Using Accord.Imaging in UWP
(apologies for beginner question) I am trying to use Accord.Net Imaging function in an UWP windows 10 App. Any function I try gives me an error:
The type 'Bitmap' is defined in an assembly that is ...
- 91
1
vote
1
answer
261
views
Determine whether a source resolution belongs to the specified aspect ratio
I would like to determine whether a source resolution belongs to the specified aspect ratio, in C# or VB.NET.
Currently I wrote this:
/// -------------------------------------------------------------...
- 20.4k
1
vote
1
answer
1k
views
Speed Up Image Sharpening and Related Image Optimizations in .Net
My goal is to allow the user to improve image quality by providing the options to improve the sharpness,Contrast etc of a Bitmap
I have followed the approach mentioned in https://www.codeproject.com/...
- 6,470
3
votes
3
answers
671
views
Precisely scale image
I am trying to precisely and predictably scale an image in C# to a different resolution, both up and down. When I open the resulting images with external tools such as Gimp, the results are not ...
- 2,265
0
votes
2
answers
3k
views
.NET, convert png file into RGBA 32bit Bitmap, in memory
var image = Image.FromFile(@"C:\image.png");
How do I convert this into a Bitmap in rgba32b format?
- 9,766
1
vote
2
answers
1k
views
Free imaging library (autocontrast, deskew, binarization...) [closed]
I've found paid components like LeadTools, but the project I'm working is open source, I would like to use free tools.
I need to apply several image correction filters to an image to apply some ...
- 13.9k
1
vote
1
answer
579
views
vb.net Screen Capture of form2 with form1
i have a problem here.
I have a form1 which i use to get settings en so on.
But there is also a panel that i want to use to see whats inside form2.
Form2 = a fullscreen form without formborderstyles
...
- 139
0
votes
2
answers
1k
views
Byte array image crop performance issue
Have two pointers (byte*) to 1. B8G8R8A8 pixel data 2. byte buffer to put cropped pixel data, very simple issue. Here is my implementation:
private unsafe void Crop(byte* src, byte* dst, Rectangle ...
5
votes
1
answer
3k
views
Create a Bigtiff (>4GB) File with Bitmiracle Libtiff.net
First I want to thank Bitmiracle for this great lib. Even while creating very big files, the memory footprint is very low.
A few days ago I ran into a problem where I wanted to create a tiff file ...
- 4,013
0
votes
2
answers
629
views
How do I use pre-allocated memory when loading a Image in .net
I am wondering if it is possible to load an Image-File directly to the preallocated memory WITHOUT a new allocation for the bitmapimage itself.
I wrote a sample class to demonstrate what I want to do....
- 4,013
-1
votes
1
answer
279
views
How to do simple ball tracking? [closed]
I'm working in this project under .Net (yes I know, I should be using something different). The idea is to be able to track a ball moving down a table, the lighting situation is usually the same and ...
- 316
1
vote
2
answers
714
views
Having issue converting 32 bit images to bitonal black and white
I have the following code routine...
Public Shared Sub ConvertToBitonal(ByRef Source As System.Windows.Media.Imaging.WriteableBitmap)
If Source.Format = System.Windows.Media.PixelFormats....
- 33
0
votes
1
answer
873
views
Memory Leak when Updating WPF Canvas Background
I'm sure the solution to this is simple but I'm left scratching my head so maybe someone can shed some light here.
What I am doing is when my program starts I load an input file into a private ...
- 33
1
vote
1
answer
2k
views
Getting BitmapImage PixelHeight Property causes Initialization Issues
I have a BitmapImage that I want to get the PixelHeight and PixelWidth properties so I can determine whether it has a landscape or portrait layout. After I determine its layout, I need to set either ...
- 1,813
5
votes
3
answers
7k
views
Is there a way to resize an image using GPU?
Is there a way to resize an image using GPU (graphic card) that is consumable through a .NET application?
I am looking for an extremely performant way to resize images and have heard that the GPU ...
- 5,756
1
vote
1
answer
157
views
Need to utilize OpenNETCF v2.x Imaging in application that has assemblies built on OpenNETCF v1.4
I have an existing WM application that I need to capture photos with and it looks like the Imaging class in OpenNETCF v2.x is the best bet because I am running into the "Out of memory" exception when ...
- 13
2
votes
3
answers
5k
views
Write text to image with indexed pixel format
I have monochrome TIFF files (1 bpp) that I would like to write text to. When I load them into System.Drawing.Image, and try to instantiate a Graphics object from that image, I receive the error, "A ...
- 12.1k
15
votes
4
answers
22k
views
How do you convert a byte array to a Bitmap instance (.NET)?
I am working with cameras (in this case monochrome) in VB.NET. The API of the cameras is in C++ and the manufacturer provides wrappers. As is typical in these cases, the image is returned as a Byte ...
- 4,105
8
votes
2
answers
5k
views
Determine image overall lightness
I need to overlay some texts on an image; this text should be lighter or darker based on the overall image lightness.
How to compute the overall (perceived) lightness of an image?
Found something ...
- 5,574
3
votes
3
answers
30k
views
Image.FromStream: Parameter not valid
I am trying to create an image from a byte array. The byte array is created by a fingerprint scanner (cf CaptureFrame method). fwidth is 256 and fheight is 255.
When I run the code below, I get
...
- 881
3
votes
1
answer
3k
views
How to add text to images with the CMYK ColorSpace in .NET 4
I am working on a project that at it's core involves adding text to an image, so as an example given a background image (B) and some text in a specified font, point size and font (A) the two are ...
- 6,378
0
votes
2
answers
956
views
Native .NET PNG image file encoder
Does such an encoder exist? The GDI+ one is not very fully featured. For example, it will always render out 32bpp images, even if you're using 8bpp indexed in-memory.
I'm about to start writing out ...
- 310k
1
vote
1
answer
327
views
.NET Image problems on ListView in WinForms App (displaying incorrectly)
I am experiencing very weird issues surrounding Images. I have a settings window, which has a ListView on the left hand side which has various image icons which when clicked update the panel to the ...
- 2,139
1
vote
0
answers
165
views
open multi image pages to different Bitmap objects in .net
I am developing an image editor and the structure needs a different Bitmap object for each page. But in .net i couldnt find a fine way.
When i use Bitmap.Clone() it gives the same bitmap (not only ...
- 156
10
votes
4
answers
3k
views
OCR engines designed for screen-reading
Are there any OCR engines designed for identifying text in screen-captured images rather than scanned text? I have a project where I need to retrieve and identify text in an application, and none of ...
- 35.8k
2
votes
2
answers
436
views
.NET photo processing component
I'm looking for a .NET image processing component or an open source alternative to automate the following tasks:
Photo capture (webcams and photo cameras)
Photo printing (grid/strip modes)
Applying ...
- 5,468
1
vote
2
answers
433
views
How to determine the transparency color of a bitmap
I know you can programmatically determine the tranparency color of a .gif
Is there a way to do the same for a Bitmap?
Right now, I am doing this heuristically by sampling around the outer edge but ...
- 37.1k
4
votes
3
answers
3k
views
Converting a GUID to System.Drawing.Imaging.ImageFormat
I store information about images in a database - also their ImageFormat (jpeg, png etc).
Console.WriteLine(System.Drawing.Imaging.ImageFormat.Jpeg.Guid);
Outputs: b96b3cae-0728-11d3-9d7b-...
- 12.4k
7
votes
3
answers
5k
views
How to implement pan/zoom on gigapixel bitmaps?
In my project, I'm using (uncompressed 16-bit grayscale) gigapixel images which come from a high resolution scanner for measurement purposes. Since these bitmaps can not be loaded in memory (mainly ...
- 3,312
6
votes
3
answers
7k
views
Printing a WPF BitmapImage
What's the best way to print a BitmapImage? I come from a background in System.Drawing so I was thinking about converting it to a Bitmap and then printing it, but I'm thinking there's probably a ...
- 8,703
1
vote
3
answers
1k
views
Image Property Tag Constant
I'd like to use the image property tag constants defined in GDI+ from .NET.
I wonder whether these constant values (e.g. PropertyTagGpsVer constant) are exposed in any of the Base Class Library?
I ...
- 8,901
1
vote
2
answers
7k
views
Combine two images with one being transparent
I have two bitmap images. One contains a picture taken with a usb camera. The other will contain a shape, like a rectagle, but it can also be a trapezoid, or lets say, a random shape with only one ...
- 19.9k
1
vote
1
answer
2k
views
Image Resize C#,VB.NET Opensource Library
Any one point me on good direction on how to resize a jpg image to exactly particular size (Both File size and pixel size Ex. 148 x 72 px , 300 KB ).
To Acheive this, Quality of images can be ...
thya
5
votes
2
answers
7k
views
Effective way of making negative of image without external dlls
That is the solution to make a negative from a image in C# Windows Forms without any dlls and in a effective, fast way?
- 26.1k