Mimic Picasa's Rendering Of Reduced Quality Image To Speed Up Drawing?
Jun 23, 2010
I have an owner-drawn control where performance is an issue during quick repaints such as object drags, resizing and painting the selector square. i have noticed that several other apps, including Picasa, will temporarily draw a reduced-quality image during fast repaint scenarios and then update the image with a higher-quality version when the UI "settles down."
How should I (can I?) produce a lower-quality image to paint when many quick redraws are taking place? Are there other strategies similar to this i can employ to increase performance (or fake increased performance.) [code]...
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Nov 24, 2008
I made a graphics program in VB6... I then wanted to remake it in VB.NET (I believed it would be faster).
To convert it I wrote both the VB6 and VB.NET versions from scratch side by side. What I have found it that the VB6 code is MUCH faster than the VB.NET program... which I can't understand... (Please note that when not rerendering it in VB.NET it is much faster than VB6)
Here is the VB6 code
[CODE]:...............................
How do you do this in VB.NET?
EDIT: Also... why do I have to multiply Me.ClientSize.Width by 3 for it to be the right size... it doesn't seem to add up.
EDIT2: The smaller the radsize the more efficient VB.NET is compared to VB6... so perhaps it has something to do with the setpixel in VB.NET
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Oct 22, 2008
i'm creating 64 button dynamically during run time. and from database i'm getting the description, font color, back color and picture path. and if the picture path is not nothing, then i need to display that picture in that button. if picture path is nothing, then need to display the description as button text using font color and back color.
this button values are not loaded only once. using button click Addhandler, each button values keeps on changing each time.
The Code i used to display is
Code:
For Each c As Control In Controls
If c.Name = "ItemBtn-" & x Then
c.Text = ButtonText
[Code].....
while i run the program, the image is diplaying in correct button if picture path exist and button that didn't have the picture path is displaying the text.
but the image is not fitting inside the Button. i can see only half of the image. i need a way to make the Image stretched or reduced to fit inside button.
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Aug 9, 2009
I have an app that reduces images fo email which works fine but the save does not include the Exif metadata
How do I save a reduced size image with Exif data
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Dec 28, 2010
'm working on an Image Encrypting software which reads out all the pixels of an image and then relocating the pixels in some way.
My Code is as below
Dim Img As New Bitmap(tbEpath.Text)
Dim ImgSize As Integer = Img.Width * Img.Height
Dim Pixels(Img.Width, Img.Height) As Color
[code]....
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Oct 3, 2011
I am trying to edit an image. I can open the image with Picturebox1.load(mypicture)
I can change the pixels/edit the picture by Dim img as new bitmap(picturebox1.image)
[Code]...
now here is the weird part. When I save the image the filesize INCREASES..but the picture dimensions are the same Example... TEST.PNG 1.3KB, when opened up via picturebox/saved the image is now 2.3KB
not sure why...i even though I specify system.drawing.imaging.imageformat.PNG
samething with JPG... it actually SHRINKS it evenmore.. example 88KB jpeg.. saved as jpeg is now 47.7KB...
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Jan 6, 2012
My program draws a few hundred labels and depending on certain criteria, they may be visible or not. I figured that it would be pretty slow anyway, but even if there's only a few labels visible, it does a weird flicky thing for a few seconds before drawing them - at the same speed if there are a lot visible.
[Code]...
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May 4, 2012
I'm trying to pass an image showing to the user a countdown. For this, I'm using a separate thread where I'm checking when the countdown timer should be started, and when so, I draw an image for every 6 seconds passed.
What's annoying is when I pass the drawn image to the UI, the quality of the image is changed and it looks bad to the user.
This is my little script that handles the drawings:
Try
remainingTime = (#12:04:00 AM# - (DateTime.Now - local_DateTimeclick)).ToString("HH:mm:ss")
remainingTimeInSeconds = Convert.ToDateTime(remainingTime).Minute * 60 +
[Code]....
Also tried with changing the properties of g, but there was no positive effect.
what can i do to make this properly work without changing the quality of the returned image?
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Aug 20, 2011
I have to create an image that is to mimic a single clock rotating hand within a square area,and the user has to choose the width and speed of the rotation and the direction.i managed to create the square area with a hand inside,with this codes and variables,
(Dim Mygraphics As graphics = e.graphics
mygrqaphics.Draw Rectangle(pens.color x1,x2,y1,y2)
mygraphics draw line(pens.color,x1,x2,y1,y2),now i have to find codes and variables to rotate the hand or line within a square area.one point remaining constant the other moving.
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Jan 10, 2009
I've developed an application that acquires images from my Logitech QuickCam Pro 9000 using WIA. The problem is that I cannot figure out how to adjust the quality of the image taken by the camera. The camera has a 2MP lense, but the program will only acquire a picture of 320x240 pixels, which is the lowest resolution the camera has. How do I tell the camera to take a picture at one of it's other resolutions? IE: 640x480, 960x720, 1.3MP, or 2MP?
[Code].....
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Nov 17, 2009
I got this code from this forum, it works perfectly but I have a problem where when you resize the images, the quality of the image becomes not as good, is there a way to keep it in the same quality as it is when resizing?[code]....
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Sep 16, 2010
I had this question before "Resize image on the fly make the image lose quality online but locally works nice".And what i got now is that it's not a problem of local or online, i ran this resize on the server itself "dedicated server", and i got the same bad quality image, so the problem is in the IIS configurations.What in iis can make this bad quality image happen?
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Mar 1, 2010
I'm using below code 2 add image into a picturebox during the run time. i could add image but when i clicked the picture to make it become smaller, the picture quality is blur which not as the initial picture.
[Code]...
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Mar 26, 2010
I'm using iTextSharp to print a PDF document. Everything goes ok until I have to print the company logo in it. First I noticed that the logo had poor quality, but after testing with several images, I realize that was the iTextSharp rendering it poorly.The test I did to say this was to print the PDF using my code and then edit the document with Acrobat 8.0 and I drew an image. Then printed the two documents and saw the noticeable difference.My question is that if anyone know if this can be due to a scaling problem where I'm failing to tell iTextSharp how it must render the image or is an iTextSharp limitation.
[Code]...
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Oct 30, 2009
I have a routine that creates a report which includes text and graphics. When I print to a PDF or printer the output looks great. When I draw the report on an image to save as a PNG, GIF, JPEG, etc. it does not look as good and I understand that is related to the 96 dpi native resolution. However, I made some modifications, and even though the graphics part of the image looks better, the text does not look as good as the PDF. I am creating the image using 300 dpi and text rendering is set at the highest quality.
[Code]...
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Mar 19, 2010
The Vb.Net application creates a bitmap from scratch and either converts to a tiff or sends it to a printer. In both cases, the quality of the image (in this case the font) is not good at all. The sample code listed below creates the graphics object that I use to write to the image.
Dim gr2 As Graphics = Graphics.FromImage(New Bitmap(800, 1000), Imaging.PixelFormat.Format32bppPArgb))
[code]......
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Aug 17, 2009
With this line...
If PictureBox1.Image = My.Resources._2star Then
I get this error: Operator '=' is not defined for types 'System.Drawing.Image' and 'System.Drawing.Bitmap'.Is there another way to say = with images?
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Feb 20, 2009
The source code for this task is here: copied the VB code to Break TIFF file with multiple pages to be displayed in a Picture Box. I did modify one line of code for testin¦
'Save the master bitmap
MasterBitmap.Save("C:UsersmyselfDesktopxx.tif", info, ep)
[code].....
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May 23, 2009
Is it possible to convert an object form System.Drawing.Graphics to System.Drawing.Image?
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Jan 21, 2010
Here is my favicon code
Dim oURL As Uri = New Uri(e.Uri.AbsoluteUri)
Dim favicon As Image
If oURL.HostNameType = UriHostNameType.Dns Then
[code]....
The error is Value of type System.Drawing.Image cannot be converted to System.Drawing.Icon Is it even possible to make the favicon be the icon of the form?
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Apr 3, 2009
im using an MDI parent form and MDI Child. how can i print the image that's inside a picture box that's inside the Child from a button that's on the Parent?when i try to use print preview or print dialog, i can't get it to recognize that the document is the picure inside the picture box. i've looked up this error message:Value of type 'System.Drawing.Image' cannot be converted to 'System.Drawing.Printing.PrintDocument'.[code]
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Aug 11, 2011
I am currently using Visual Studio 2008 (VB.Net) and SQL Server 2008. I have images saved on the database as image. When I fetch it into my code it is a System.Byte[] and I am unable to cast it as a System.Drawing.Image to save to my DevExpress(v10.2).XtraEditors.ImageEdit.
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Apr 9, 2012
I am making a web browser using geckofx. I have put the favicon in a picture box but I have changed my mind and now I want it as the form's icon. The code for the favicon is:[code...]
The favicon works fine in the picture box but i think it will look better as an icon. If i change the line Me.PictureBox1.Image = favicon to Form1.icon = favicon I get the error Value of type 'System.Drawing.Image' cannot be converted to 'System.Drawing.Icon'. How can I get this to work?
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Jan 20, 2010
I have a System.Drawing.Graphics g, which draw something in a PictureBox. Now I want to export this pGraphics to a new System.DrawingImage pImage (or Bitmap). But how?
Dim pImage As Bitmap
Dim g As Graphics
g = Graphics.FromImage(b)
[Code].....
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Mar 10, 2010
I have two graphics I'm trying to superimpose into one, then display in a DataGridViewImage cell...The Value property of a DataGridViewImage is an Image type.
Dim Image1 As System.Drawing.Image = imgl_Imagelist1.Images(0)
Dim Image2 As New Bitmap(imgl_ImageList2.Images(0))
Dim DualGraphic As Graphics = Graphics.FromImage(Image1)
[code].....
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Jun 4, 2012
How can I draw an image in a program using visual basic, without actually drawing the image first on an graphics program or on paper?
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May 2, 2010
My objective here is to paint an image onto a certain part of ANOTHER image. So I'm technically trying to copy one picturebox to another one.
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Dec 21, 2009
I am trying to use Bitblt for drawing one image on another. but when i try to get HDC From first image it gives Negative pointer value, so BitBlt returns 0 value. is it possible to get device context from bitmap directly?
[Code]...
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Aug 8, 2009
I have an app that displays images (using picturebox component). what I am trying to do now is to try to allow the user to resize the image how he wants it (scale). for this i think I need to create an instanece (bmp) clone of the selected image in the picturebox and draw it ontop of the original picture; then specifi new set of size points.I was trying to use the code below:
Graphics.FromImage(PictureBox1.Image).BeginContainer('i do not know what to do here')
I need to specifi the new size of the graphics container but I do not seem to have any clue on how to do it.
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Jul 13, 2009
I encounter a problem when I try to save a graphic. Drawing and displaying the graphic is no problem, but when I try to save it on file it always results in an empty image.
My code so far is:
Initialization:
Public Class ImageDisplay
[code].....
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