Part of .NET's System.Drawing Namespace - Bitmap.LockBits Method
Locks a Bitmap into system memory
Docs: https://learn.microsoft.com/en-us/dotnet/api/system.drawing.bitmap.lockbits?view=netframework-4.7
Questions tagged [lockbits]
95 questions
2
votes
2 answers
How can I color pixels that are not black in bitmap in yellow using LockBits?
Using GetPixel and SetPixel is easy but very slow so I'm trying to using LockBits.
I have this method I did long time ago to compare between two images:
public static Bitmap FastComparison(Bitmap bmp1,Bitmap bmp2)
{
tolerancenumeric =…
James Aharon
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votes
1 answer
Why does Bitmap.LockBits fail on VM's
I use an XP VM and a Vista VM for smoke testing my applications before I deploy them. Both of these VM's are using 32bit color. Not sure if it makes any difference but I'm using VirtualBox. Each machine is also allocated 2GB of ram, 2 processors. XP…
Richard Moss
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2 answers
Lockbits with ushort greyscale values
I want to create a bitmap from given 16 bit greyscale values. So far I have this code:
var value = CamData.ToArray();
var b = new Bitmap(160, 112, PixelFormat.Format24bppRgb);
var bdata = b.LockBits(new Rectangle(0, 0, 160, 112),…
h0ppel
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2 answers
C#, Lockbits image processing with artefacts, changing pixel format
Im implementing my own function to binarize fingerprint images. In my method i try to work with LockBits for the first time.
Could you explain me, why i get a lot of artefacts on my images? Eample:
On the left picture i binarize image by…
user9687180
1
vote
0 answers
GDI+ Bitmap LockBits returns rotated image?
I loaded an image from file and want to write it to AVI file:
Gdiplus::Bitmap frame(L"test.png", FALSE);
Gdiplus::BitmapData bmp_data = {};
Gdiplus::Rect rect(0, 0, frame.GetWidth(), frame.GetHeight());
frame.LockBits(&rect,…
Andriy Tylychko
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Vb.Net 2015 - Issue with byte array storage and comparisons using lockbits/marshal.copy
I'm new here, so pardon me if my question is not in the proper format to produce a response. Please let me know if I need to add anything:
I'm currently working on a project from home for a mate at a company that uses a really old legacy system that…
RiGMiK
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- 2
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vote
0 answers
Lockbits: The array sequence is mutating somewhere
I'm using the lockbit method to manipulate an image, but I have noticed that after I save the image using the save method of the Bitmap type, the data that I manipulate in the byte array I get out of the lockbit, is manipulated.
For example…
Arnold Zahrneinder
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Purpose of ImageLockMode in Bitmap.LockBits
I'm working in C# and I've got a question about the Bitmap.LockBits method.
Let's say that I have a Bitmap called myBitmap and use LockBits on this bitmap:
BitmapData bmpData = myBitmap.LockBits(new Rectangle(0, 0, myBitmap.Width, myBitmap.Height),…
Henrik123
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2 answers
C# LockBitmap - xy-coordinate to Pixel byte conversion
I am trying to learn LockBitmap class for image processing and I came across this code posted below. Basically it returns the color of a x-y coordinate.
Of course this method only works after I perform source.LockBits() and Marshal.Copy() / unsafe…
Liren Yeo
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1 answer
How to use DrawEllipse in a LockBits array (How to generate a set of pixels that forms an ellipse)
I'm using this class to fill pixels of a bitmap based on the LockBits function:
Imports System.Drawing.Imaging
Imports System.Runtime.InteropServices.Marshal
Public Class Fill
Public Shared Function Process(ByVal b As Bitmap) As Bitmap
…
41686d6564 stands w. Palestine
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How do I correct this LockBits math error?
Using GetPixel/SetPixel, I was using the following to power an image filter that emphasizes reds and purples:
for (int y = 0; y < bmpMain.Height; y++)
for (int x = 0; x < bmpMain.Width; x++)
{
bmpMain.GetPixel(x, y);
Color c…
MaoTseTongue
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1
vote
1 answer
Mifare Ultralight C Lock
I'm attempting to lock a Mifare Ultralight C tag. I want to set NDEF pages 0x04 to 0x27 to read-only. I think this can be achieved via Ndef.makeReadonly().
Additionally, I would like to set pages 0x29 to 0x2F to be password protected (for read and…
Rob
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vote
1 answer
LockBits() Throwing 'Out Of Memory' in Parallel Foreach?
Iam new to the c# and Parallel processing. I am trying to process the bunch of images and i have written methods for processing.And I have added the Parallel foreach loop on imagelist as below
Parallel.ForEach(Directory.GetFiles(path), new…
user2721874
1
vote
0 answers
Getting Each Colour of Pixel From my LockBits
I have a program which gets every pixel in an image and outputs them into a text document. The problem is that it just throws them in there are as numbers and it looks rather ugly.
e.i. " 37 37 37 36" I wish to display them much like the GetPixel…
rguarascia.ts
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1 answer
Enlarging an image without blurring by taking one pixel and turning it into four on a new image with different dimensions
I have previously written an image enlarger algorithm that enlarges images without blurring by doubling the image size and making a single pixel into four pixels on the new image. This was originally built for 500x500 pixel images and it worked…
Henry Hunt
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