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
0
votes
1 answer
How to write protect an NTAG203 NFC chip programmatically on android?
I've been looking into NTAG203 NFC chips for a membership card solution and intend to set up and write a unique ID onto each card.
Oddly I can't find much online about how to write protect NTAG203 chips although I can find write-protected ones being…
Ali
- 3
- 4
0
votes
1 answer
DrawImage is slow, lockbits to the rescue?
I've read many C# tutorials on using lockbits to manipulate images, but I just don't know how to apply this info into PowerShell.
This is the problem:
$image1's height is 2950 pixels. $image2's height is 50 px taller, 3000 pixels. I need to fit…
Lunar Remedy
- 37
- 2
- 9
0
votes
1 answer
How do I remove read only mode from NFC tag
I am using NTAG203 NFC tags. I made it read only mode by mistake. How can I change read only mode to writable mode?
user3678419
- 11
- 1
- 4
0
votes
1 answer
Cropping white space from image right side in C#
I have some images, which contains a lot of white space at the bottom and the right side. I want to crop that white space before displaying to the user.
So far I've implemented non-white pixels detecting from the bottom.
Pixel format is…
user3232395
- 19
- 8
0
votes
1 answer
BitLock-GetPixels. Time and PixelFormat
Okay, I've created two programs. One that uses GetPixels and another that uses LockBits. My GetPixels program is as follows...
The stripe picture referred is a 200x200 jpg
Stopwatch GetTime = new Stopwatch();
Bitmap img = new…
rguarascia.ts
- 694
- 7
- 19
0
votes
1 answer
Problems with Lockbits and GetPixels
I am trying to get all the pixels in an image using a Bitmap and GetPixels. Now I know that it is very inefficient so I have been looking into LockBits. I have successfully made what I think locks the bits but I can not get each and every pixels. My…
rguarascia.ts
- 694
- 7
- 19
0
votes
1 answer
Moving through each pixel for 1bpp Pixel Format
I had a question related to the use of Lockbits method in C#..
I have a 1bpp Image and I'm trying to access all the pixels of the image but some are still left out.
public Bitmap Pixels(Bitmap original)
{
Rectangle rect = new…
Afifa
- 5
- 2
0
votes
1 answer
Why is my image considered open?
private void button4_Click(object sender, EventArgs e)
{
string originalPathFile = @"C:\Users\user\Downloads\CaptchaCollection\Small\Sorting\";
string newPathFile = @"C:\Users\user\Downloads\CaptchaCollection\Small\Sorted\";
bool…
puretppc
- 3,232
- 8
- 38
- 65
0
votes
1 answer
LockBits in Qt. How to implement?
Please tell me this analogue in Qt. How to implement this in Qt? Thx!
BitmapData btmData= currentRegionMap.LockBits(new Rectangle(x, y, width, height), ImageLockMode.ReadOnly, currentRegionMap.PixelFormat);
byte* a =…
GPPSoft
- 480
- 1
- 6
- 15
0
votes
1 answer
Removing image overlay using mask image
I'm writing a program that removes an overlay from a png image using the mask (the overlay image)
having image 1 and 2 I want to achive image 3.
I have tried using lockbits and tried many things but I can't do the math right I think
rgbValues is…
Ashkan Mobayen Khiabani
- 33,575
- 33
- 102
- 171
0
votes
1 answer
LockBits() throws ArgumentException when rectangle on 2nd monitor
I'm working on a small application that needs to display some generated test screens on a chosen monitor. I'm generating these screens as bitmaps and for ease and speed of generation I'm using the LockBits() method to generate these bitmaps.
The…
K_Trenholm
- 482
- 5
- 20
0
votes
1 answer
c# copy array of structures as bytes using Marshal.Copy()
I'm having a problem with copying an array of structures as a byte array. The structures are simple RGB structs.
public struct RGBColor { byte r; byte g; byte b; }
Then I have an array of RGBColor[] that represents a scanline that I want to copy to…
user2434792
- 23
- 3
0
votes
1 answer
Memory error when accessing pixel data using LockBits
I'm getting this error when using the code below to access the pixel data of three different bitmaps:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
C# code:
var bmpDataA =…
Joey Morani
- 25,431
- 32
- 84
- 131
0
votes
1 answer
Corrupt memory with LockBits (DirectShow webcam)
I'm doing some image manipulation in .NET (VB 2010). I'm using the following code (which doesn't do anything yet):
Sub Manipulate(IMG As Bitmap)
' Dim foo(100000) As Integer - will need it later...
Dim bd = IMG.LockBits(New Rectangle(0, 0,…
Dave
- 690
- 4
- 7
- 16
0
votes
1 answer
VB.Net - Lockbits - Greater Than / Less Than functions
The following code works well for what I am doing. However, it is taking longer than I need it to. The problem is that it iterates over each greater than/less than function and that takes time. I've done some research but can't figure out how to…
Jerry Horak
- 1
- 1