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How Do You Convert An Image Size To Pixels?


I need to resize an Image object and I've got a procedure that I think will do it (using GDI).
My problem is that my Image object can be scaled in either cm, mm or inches.
I need to know it's size in pixels to use the procedure.
Is there an easy way to work this out?

Mac




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User Scale To Pixels: How To Exactly Convert?
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Pixel = (ScaleWidth - 1) * (User - User1) / (User2 - User1)

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Is this even possible? I want to display a "page" (it can have any height and width, but for now let's go with the regular old 8.5 x 11).

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I googled about this topic and come across "twips" which sound like the solution...except they're gone in VB.NET.

Thanks,
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Pixels And Printer Resolution/size
Hi all,

i am using a control which has got printing capabilities. You need to set the printer resolution in pixels for it in order to get the print at the right size. It there some way i can calculate it?

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per-i

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i have to use a picture as a caption in some buttons and this image must be created outside of VB. to do that i need the size in pixels, not in twips.
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i can know the size of a form in pix changing scale mode property, but this property isn't on cmd buttons



Edited by - xadap on 10/17/2005 9:50:01 AM

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I have an Image control.. How do I determine the Size of the image loaded in pixels....

Im using:
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but its coming out with 22.9 (I know the image is 13x13)

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Thanks in advance
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Getting Transparent Pixels From A Png Image
Hi. Basically, I'm trying to take a png image and determine which pixels in the image are transparent. The program would do a one time run through each pixel in the png to figure out where relevent image data is located. The idea is to use this information to intuitivly crop certain parts of the image for use in another part of the application. Using the GetPixel api and the picturebox point method do not work correctly as they cannot tell me when a pixel has a transparent value.

I suppose the only solution would involve reading data out of the actual png file, but I don't know where to begin in regards to this.

Since I'm using DirectX8 to render the images, i was wondering if there is a way to get this information from a dx8 device, texture or surfacedescription.

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Writing Pixels To Image In CE (using VB6)
I am writing a program in VB6 and want to write directly to an imagebox or picturebox somehow. I posted this in http://www.vbforums.com/showthread.php?t=444408 about a week ago and there has been (1) NO activity at all in that forum since and (2) no reply so I thought I'd bring it here. Seeing as I'm writing in VB6 I guess it could be considered classic VB (and what could be more classic VB than CE :-))

Anyway, here's the post I made back then, copied word for word:

"I am writing software in Windows CE for my Win Mobile 5 handheld PC. The reason why I am using CE is I have very little (next to none) experience in .NET and I feel more comfortable writing in a VB6 environment (and I have a CE development system installed to allow me to do this in VB6).

A piece of code I am writing displays a map on-screen (taken from streetmap) in an image box. It loads a BMP file (seems CE items can only load BMP or even less efficient image formats) and displays it in the image box which I will then use for navigation (not through a GPS system...I'm not writing that sort of program). I want to then read in the values of specific pixels within that image and perform a filter on the pixel and re-draw it on the image...I basically want to highlight specific streets and will have co-ordinate data on each street in the program.

Has anyone got suggestions on how I would be able to manipulate pixels in an image like that?

Another aspect of this program I am working on is a more efficient way to store map-style images by reducing the number of colours...in theory I could get the maps I am displaying into about 5k or so...I'm looking for a method that could manipulate an image fast enough in CE, but the priority here is the above (editing specific pixels rather than the whole image :-))"

Getting Black Pixels In An IMAGE
i am trying to get only the black pixels in a black&white picture.
i found this code on the internet and tried to make it work.
but in the end it always answers 0 black pixels found.

here is the code:

Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, _
ByVal y As Long) As Long

'The subroutine below counts the number of a given color in a PictureBox control:

Function CountPixels(color As Long, picBox As PictureBox) As Long
' PictureBox's ScaleMode
' must be set to 3 - Pixels
Dim x As Long, y As Long
Dim handle As Long, count As Long

' cache form's hDC property
handle = picBox.hdc

For y = 0 To picBox.ScaleHeight - 1
For x = 0 To picBox.ScaleWidth - 1
If GetPixel(handle, x, y) = color Then
count = count + 1
End If
Next
Next

CountPixels = count
End Function


'Usage:

Dim blackPixels As Long

blackPixels = CountPixels(vbBlack, PictureBox1)

MsgBox "Number of black pixels: " & blackPixels

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i have an picture in c: named test.jpg.. is there anyway i can find out if it is 1000X1000 pixels or 500X400 pixels. i want i to be returned as text..

Read The Pixels Of An Image
I m trying to read the pixels of a monochrme image
i created an Image control and loaded it with a BMP file that I had
and did this based on clicking on a PB control

For row = 0 To 144
For col = 0 To 288
PSet (col, row), 0
Next col
Next row


i know the BMP's pixels are 288 x 144 cos pbrush of windows haircross tells me so
but what i dont understand is the size of the image that this BMP contains is (width 7 height) in proprties panel is something like 4120, 2160 pixels

whats going on ?

Resize A Jpeg Image To 100 X 100 Pixels
i have a program that saves data to a text file and a picture as a bitmap when the save button is clicked but before i can load the picture into the picbox i have to resize it to 100x100 using another pice of software. How would i resize my image when it is loaded to 100x100 (the source image is quite large as it is from a digital camera)

thanks in advance................ RedAngel

To Get Data Pixels From Image To MASM
Hy everyone,

My programm can load pictures in VB.... What I want to do is filtering a person from a blue background, then I want to paste this filtered image above a picture of a wheatercard.

The filter proces will I do in MASM, but first I need to know how I can get the data of the pixels (the color information) from the image from VB into MASM.

I hope someone can help me solving this problem

Greetings,
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Calculating Total Black Pixels In An Image
this is the algorithm for calculating black pixels and then finding them recursively in the image...how do i change it into a VB program?



Code:
//tests if a pixel is black
/*==============================================================*/
bool IsBlack(int row, int col, LPVOID BaseAddress)
{
//a pixel’s RGB val is returned
COLORREF* pPixel = ((COLORREF*) BaseAddress) + row * 640;
COLORREF curPixel = pPixel[col];

BYTE red = GetRValue(curPixel);
BYTE blue = GetBValue(curPixel);
BYTE green = GetGValue(curPixel);

int black = 150; //RGB value to determine if Pixel is Black

//returns black if RGB vals < highest acceptable black val
if (red < black && blue < black && green < black)
{return true;}
else
{return false;}
}

Code:
MapPattern(row, col)
{
/*Checks the above pixel if it is black and unmarked, if it is then the pixel is flagged */
/*into the Points structure and the MapPattern function is run with the above pixel */
/*as the parameter*/
if (Field[row–1][col] = black AND Points[row–1][col] != 1)
{
Points[row – 1][col] = 1
MapPattern(row – 1, col)
}
/* The same process checks the pixel beneath the input
location (note the statement checks if the pixel is pre-
existing before reentering the recursion*/
if (Field[row+1][col] = black AND Points[row+1][col] != 1)
{
Points[row + 1][col] = 1
MapPattern(row + 1, col)
}
/*Checking the pixel left*/
if (Field[row][col–1] = black AND Points[row][col–1] != 1)
{
Points[row][col – 1] = 1
MapPattern(row, col – 1)
}
/*Checking the right pixel*/
if (Field[row][col+1] = black AND Points[row][col+1] != 1)
{
Points[row][col + 1] = 1
MapPattern(row, col + 1)
}
}

Calculating Number Of Black And Red Pixels In A Image
hi..can anyone help me with the code to count the number of red and black pixels in an image? Pls reply as soon as possible. Really appreciate it

this is the algorithm for calculating black pixels and then finding them recursively in the image...how do i put it into VB?

Code:
//tests if a pixel is black
/*

Flipping A Picture (GIF) With Transparent Pixels In Image Control
Hello!

Before I say that it's impossible to do, I wanted to be sure.

I will closely describe my goal, first:
loading an Image control with a GIF file with transparency results in an object that is transparent in some areas, though it still responds to mouse clicks on these areas. A picturebox, however, does not allow this feature.

I want to have an image with its own picture flipped, without losing the transparency features. Is it possible?
(Please only let me know if it is impossible, I am not interested in doing a workaround at this time.)

I already tested BitBlt. It loses the transparency information.

Image Box, Thumbnail And How To Open Form Pixels And Twips
how do i make it so when a user clicks on a thumbnailed image, it opens a new form as big as the width and height of the image.

i have the width and height that i read from a database but the form opens in twips and not in pixels????

File System Object To Find Image Width In Pixels Or Twips
is it possible to use the FSO to get an imaages
width and height?

I have a MDI child form and i need to resize
it to the size of any given image.

i thought maybe i could use the
file system object but i'm not sure if you can
get these propertys w/ it.

any suggestions on how to resize my form to
the width of an image are appreciated.

thanks

How To Convert A Monochrome Image To A Pseudo Colored Image?
Hi Guys,

I need some help here. I have some monochrome (grayscale) images (.bmp format) here and i need to convert them into pseudo colored images making use of a lookup table (LUT).

What's going on here is:
I have some images that have just been captured by an IR Camera. To make these hotspots more visible to the user, I need to match certain temperature higher than a certain threshold to a color say Red.

Question:
Since the image is monochrome, the image will consists of the pixel values and not temperature information right? (or is it that this pixel values/intensities of the thermal image are the temperature information?)

So now, how do I create a LUT to match the temperature to a certain pixel value? I am rather confused with this temperature, pixel value and color concept. Can someone help me with this?

Can someone guide me with this conversion of monochrome image to a pseudo colored image? I am stucked here for quite a while now. Your help will be greatly appreciated

Thanks alot guys.....

Regards,
Justin

Zooming Various Size Image To Fixed PictureBox Without Changing The Image Ratio
Yup!I need to scale different size image into a fixed picturebox. Without changing the image height vs width ratio.any of you can help me? thanks.
1)scale the image as big as possible depending the fixed picture box height or width.


I use the loadpicture function in loading picture.
If I use the image control, I found the stretch function will cause the image height and width ratio change.

thanks

(Image Size, Image Adrress, And Creation Time) Of A Process ?
how can I get (Image size, Image Adrress, and Creation time) of a process if I knpw the ID or the handle ?!

thanx,

How Can I Figure Out The Size Of An Image File Without Loading The Image?
There might a control or two on the market that do that, but i think they require that the image be loaded as well, so i don't think you'll be able to do that.

How To Size The Image With Picture Box Size?
I use ADO and view the image on the picturebox ("Picture2").Why the image display on the picture box don't have same size with my picturebox?How to make the image display have same size with my picturebox.


Code:

Picture2.Picture = LoadPicture(Pesttable.Fields("PICTURE"))

Image Size To Picturebox Size
how can i make an image the same size as that of the picturebox displaying it.
i.e. stretching it accross the picturebox no matter how small or how big, just stretch it.

Size Window To Image Size
If I load a picture in to a picture box which is in turn on a form, how can I resize the form to the size of the picture once the picture has loaded?

Cheers

John

Conforming Image Size To Picturebox, Not Picturebox To Image Size.
Hello all, i am taking a VB course (Using VB 6) and have run into a little problem.

I need (or want) to have it so users are viewing like... a gallery of the images, on each command button in my frame i have the code
Code: picturebox.picture = loadimage ("imagepath")
(ive run into the issue of running it on another machine and the images not appearing but thats a seperate issue, a seperate topic if i need it eventually)

what ive been able to do is use
picturebox.autosize = true
to make the picture box the size of the image, but thats 4 times as big as the original box and twice as big as my program window (frame?)

ive also tried .scalehight/width but i couldnt get any change with that.

ive searched multiple forums and couldnt find an answer, any help?

thanks in advance

How Do I Convert BMP Image To JPG Image(not A File)
I want to convert a picture image (that comes from my webcam) to a JPG image before sending the image as a byte array via LAN to an image box in another computer (not a FILE).

I want JPG because it is much smaller and quicker.

All the DLL's I have found only save it as a file which is no good to me.

Maybe there is a 2 step way of creating a 'virtual file' using Filescripting?
Or I could use a ramdisk and immediately read it to a pic box but that is cludgy.
I would much rather be able to CONVERT straight to a JPG IMAGE before sending.

How Can I Convert A Raw Image Into A Bitmap Image
Can anyone help me convert an image in .raw format into bmp of jpeg - or any other common image format

Cheers

Image Size From Image Control...
Hi,

Hi, I wrote a simple app that loads an jpg image in an image control, but I need to know what the width and height of the image are... the imagecontrol is set on strectch = true.

Any help would be appreciated.

Thanks

How To Convert 24-bit To 8-bit Bmp Image ?
Hi, everyone

I'm working with 24-bit image.

After converting to grayscale (pixel by pixel), I use savepicture() function to save bmp file. But the image is three times bigger than should be, cause the image is 24-bit, despite has only 256 grayscale...

That's why I need a source code to convert 24-bit dib to 8-bit dib.

Someone could help me ?

Thanks !!!

Qs: Convert Image To Hex
Hi,
How can i convert image file(GIF or JPG or BMP or...) to Hex?
Very thanks .
Greeting.

How Can I Convert An Image From 24 Bit To 16 Bit
How can i convert an image from 24 bit to 16 bit

Hai,

I am developing an application in vb in which i had to transfer images from a client system to the server. I need to convert these images from 24 bit to 16 bit pixels. Can anyone help me in doing this ? I need some method to do this or a sample code. Also I would like to know if this can be done without dll files.

Any kind of help is highly appreciable.

Regards,
jvarma

Convert Image
sorry to anyone who looked at my last thread it was all over the place
this i hope is more straight forward
I have a simple program to convert an image in a picture box into as grayscale image ,from what i have been told it is possible to then change that image in to a black and white image with certain levels of gray being converted to black and lower levels of gray being converted into white how would i do this
here is my code to change into gray scale
what would i need to add to this code



Private Sub cmdGray_Click()
Pic.ScaleMode = vbPixels
X = Pic.ScaleWidth
y = Pic.ScaleHeight
For i = 0 To y - 1
For j = 0 To X - 1
pixel = Pic.Point(j, i)
red = pixel Mod 256
green = ((pixel And &HFF00) / 256&) Mod 256&
blue = (pixel And &HFF0000) / 65536

gs = ((red * 30) + (green * 59) + (blue * 11)) / 100
Pic.PSet (j, i), RGB(gs, gs, gs)

Next
Next
Pic.ScaleMode = vbTwips
End Sub


Convert IMAGE
dear all,

does anyone know a tool or vb program/ocx wich permits to convert 24 bits colors BMP image to 256 gray level one ? ..or guideline to do this ...

Thanks a lot,

Convert Text To Image
Is it possible to code a program that converts text into images (gif) and the other way around? 1 pixel for each ASCII-value. For example giving all 255 types of green the values a,b,c,...,?,!,... ? A sort of coder-decoder.
I planned to rewrite a ascii-generator, but they work totally different..

vb 6.0

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