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• Making Overlaid image transparent on touch in Android ?

  - by Andhravaala

  Hi All, I need help on making the touched areas of bitmap image transparent(seems like erasing) while I am moving my finger on that image. I am having a PNG file with Alpha channel in it. I want to turn the touched pixels to transparent so that, the user can feel that he is actually erasing it. For this I am using frame layout to load 2 layers. Down layer is for content and upper layer is an Imageview for erasing. I need erase the upper layer when user touch and move his finger on it. I am not getting how to make it transparent. can anyone please help me in this. If possible please direct me to any sample code, as I am very new to this image processing. Thanks in advance.

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• Create Outlines around line.

  - by Eric Muller

  Hi SO community! I am drawing graphs into a WinForms Picturebox. Now I am searching for a possibility to 'duplicate' a line (an array of points), so that the two resulting lines are positioned a fixed distance away from the original one. Like in this picture, I have the red line and want to get the black ones: I thought about just moving the line a few pixels up/right/up-right, but that leads to strange overlapping lines. Is there any other approach that does what I want? Any ideas would be greatly appreciated. Thanks!

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• Wrong image dimensions when it's dynamically loaded on a page the 1st time

  - by Nikita Barsukov

  I have the following piece of Javascript code on my web-page var central_image = document.createElement("img") central_image.setAttribute("src", imgs[curr_image_no - 1]); central_image.setAttribute("name", "jpeg"); document.getElementById("photo").appendChild(central_image); central_image.onload = getDimensions(); //function that alerts image dimensions Now, when the central_image is loaded for the 1st time in Firefox, its height always equals to 0. In IE its dimensions are 28 x 30 pixels. When I reload image, its dimensions are OK in both browsers. I guess the problem is that function getDimensions() starts before image was loaded completely. How to change that?

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• Pseudo Transparant images

  - by Samuel

  Hello World! For an assignment at university we program in a pretty unknown language Modula 2, which lacks major graphic support. I was wondering how to achieve a 'transparency' effect on images, i figured it would work like this: Create a 2D array for the background area of the image filled with the colours of the different pixels in that area, create another 2D array of the image with again the colours of every picture and than merge the pixel colours and draw the different "new colours" on their appropriate place. What i was wondering about: how do i merge the colours (hexadecimals) just: ( colour1 + colour2 ) / 2 ? Thanks for your help!!

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• CreatePatternBrush and screen color depth

  - by Carlos Alloatti

  I am creating a brush using CreatePatternBrush with a bitmap created with CreateBitmap. The bitmap is 1 pixel wide and 24 pixels tall, I have the RGB value for each pixel, so I create an array of rgbquads and pass that to CreateBitmap. This works fine when the screen color depth is 32bpp, since the bitmap I create is also 32bpp. When the screen color depth is not 32bpp, this fails, and I understand why it does, since I should be creating a compatible bitmap instead. It seems I should use CreateCompatibleBitmap instead, but how do I put the pixel data I have into that bitmap? I have also read about CreateDIBPatternBrushPt, CreateDIBitmap, CreateDIBSection, etc. I don´t understand what is a DIBSection, and find the subject generally confusing. I do understand that I need a bitmap with the same color depth as the screen, but how do I create it having only the 32bpp pixel data?

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• Third party Application's Idle Session expiry

  - by Manjoor

  We have a third party application running. It shows login dialog when idle for 20 minutes. We need to prevent the application to display login screen. We do not have any idea how idle state is handled internally in that application. We have done the follwoing with no luck. Created an small application in c# which focus it after every 5 minutes (using SetForegroundWindow()) and send a BM_CLICK message to one of its child window. Does not work. focus it after every 5 minutes (using SetForegroundWindow()) and move the cursor few pixels then restore cursor at its previous position. This does not work too! Is there any other way to achieve the goal?

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• Changing the tint of a bitmap while preserving the overall brightness

  - by MusiGenesis

  I'm trying to write a function that will let me red-shift or blue-shift a bitmap while preserving the overall brightness of the image. Basically, a fully red-shifted bitmap would have the same brightness as the original but be thoroughly red-tinted (i.e. the G and B values would be equal for all pixels). Same for blue-tinting (but with R and G equal). The degree of spectrum shifting needs to vary from 0 to 1. Thanks in advance.

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• efficient way to detect if an image is empty

  - by Jos

  Hi, I need a very fast method to detect if an image is empty. Im my case then all pixels are white and transparant. The images are png's. My current method is to load them in a memory bitmap and check each pixel value, but this is way to slow. Is there a more efficient way? This is my current code: 'Lock the bitmap bits. Dim bmpData As System.Drawing.Imaging.BitmapData = bmp.LockBits(rectBmp, _ Drawing.Imaging.ImageLockMode.ReadOnly, bmp.PixelFormat) Try Dim x As Integer Dim y As Integer For y = 0 To bmpData.Height - 1 For x = 0 To bmpData.Width - 1 If System.Runtime.InteropServices.Marshal.ReadByte(bmpData.Scan0, (bmpData.Stride * y) + (4 * x) + 3) <> 0 Then Return True Exit For End If Next Next Finally bmp.UnlockBits(bmpData) End Try

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• Question regarding CGRectIntersectsRect and rotated rectangular image

  - by user309030

  Hi guys, I've got a long rectangular image which is rotated at different kind of angles. However the frame of the rectangular image does not rotate along with the image and instead, the rotation causes the frame to to become larger to fit the rotated image. So when I used CGRectIntersectsRect, the collision detection is totally off because the other image colliding with the rectangular image will collide before it even reaches the visible area of the rect image. In case you don't really know what I'm talking about, have a look at the ascii drawing: normal rectangular image frame, O - pixels, |, – - frame |----------| |OOOOOOOOOO| |----------| after rotation |----------| |O | | O | | O | | O | | O | | O | | O | | O | | O | |----------| I've read through some of the collision articles but all of them are talking about collision with a normal straight rectangle and what I really want is collision with a slanted image, preferably pixel collision detection. TIA for any suggestions made.

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• What's your favorite programmable calculator?

  - by Pat Notz

  The HP-32S still holds a soft spot in my heart, even though it only had 4 registers. I have fond memories of writing a nonlinear solver for finding an azeotrope curve during a Thermodynamics final. Despite the increase in power, memory, pixels and features the HP-32G that followed never could steal my heart away. Here's to you, HP-32S. Let's hear it, what's your favorite programmable calculator? As with all poll type questions, do NOT submit a new answer unless your answer is not represented. Vote up your answer instead of adding yet another TI-85 or HP-49 to the list, and add comments to that answer if you want to relate specifics. EDIT: I moved my photo into an answer for polling.

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• Detecting Screen Resolution to load alternative CSS a good idea?

  - by jdln

  Im working with a graphic designer who constantly wants to make websites larger than the 960 pixels i recommend. I can do a certain amount with liquid layouts but id really love to be able to load different CSS for larger resolutions. I googled it and found the link below, but im worried that I havnt heard more about this. Is this is a reliable method? Im concerned as I would have thought that more people would want to do this. http://www.ilovecolors.com.ar/detect-screen-size-css-style/ Thanks

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• How to make CSS float left not bend around when browser width is shrunk

  - by jesse

  I have 2 div boxes. It's all working fine but when the browser is shrunk to less than 800 pixels or so, the second div moves underneath the first div. How can I force it to always stay to the right of it? #testbox1 { background-color: #0000ff; min-width: 300px; width: 30%; height: 200px; position: relative; float: left; } #testbox2 { background-color: #00ffff; width: 500px; height: 200px; position: relative; float: left; }

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• Using CSS to both scale AND reposition an image WITHIN a div?

  - by pbarney

  We know how to use CSS to show only part of an image within a div (i.e., image sprites), but the image has to be a background image. We know how to use CSS to scale an image, but the image has to be an IMG. Does anyone know of a way to scale and image and show only part of it? For example, I want to: show pixels (15,15) through (100,100), and scale it up by 200%. The first I can do by making in a background image. The second I can do by making it a foreground image. But so far, I have not ascertained how to do both. Is it even possible using only CSS/HTML?

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• WPF: How to efficiently update an Image 30 times per second

  - by John

  Hello, I'm writing a WPF application that uses a component, and this component returns a pointer (IntPtr) to pixels of a bitmap (stride * height). I know in advance that the bitmap is a 24bits rgb, its width and height. Updating the Image control with these bitmaps makes up a video to the user, but I'm not sure what's the most efficient way to do that, most of the time the CPU usage goes to 75%+ and memory changing from 40mb to 500mb and the nI think GC starts to work and then it drops again to 40mm. The app starts to not be responsive. What shoud I do? thanks!

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• Is is possible to make a shaped, alpha-blended dialog?

  - by jgaa

  I'm making a non-rectangular dialog, modelled over an image from Photoshop (the image is the background of the dialog, and the user will see trough the transparent part of the image). I'ts like a dashboard-style window for a media-app with a few custom-drawn controls. Most of the background-image is either opaque or 100% transparent - but in between there is a thin area of partially transparent pixels, ment to blend the image smootly into the background. This works great for web-graphics, but I have not found a way to make this work for Windows windows. I'm using the Windows Template Library (WTL), msvc 2008 - and the app must run on Windows XP as well as Vista and Windows 7. Currently, I'm simply using the opaque part of the background-image to create a GDI clipping-region, but this gives pretty rough edges. Does anyone know about any API functions to accomplish this (part of WTL, or reachable from WTL)?

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• Gluing tiles together using imagemagick's montage command

  - by AP257

  This seems like it might be a reasonably common question, so I'm going to ask it using as many keywords as I can think of! I have a bunch of (well, nine) tile jpegs, with standard tile filenames. Each jpeg is 220x175 pixels: (top row) tile_1_0_0.jpg tile_1_1_0.jpg tile_1_2_0.jpg (middle row) tile_1_0_1.jpg tile_1_1_1.jpg tile_1_2_1.jpg (bottom row) tile_1_0_2.jpg tile_1_1_2.jpg tile_1_2_2.jpg How can I use imagemagick/montage to 'glue' or join them all together to make a single, coherent image? I don't want to resize them at all, so I guess the final image should be 660x525. That would be montage with no framing, shadowing, bordering, etc - just the nine original images, glued together to make a single jpeg. I know it should be something along these lines, but I'm struggling with getting the order and sizing right: montage +frame +shadow +label -tile 3x3 -geometry <options> *.jpg joined.jpg

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• iPad javascript scrolling

  - by davids

  I'd like to get the same behaviour of the native javascript scrollTo function in iPad, just attaching a function to the swipe event and scrolling the content a specific number of pixels. That doesn't work in iPad using scrollTo or several different jquery plugins, like scrollTo or iScroll. I think I'm having problems because I'm working with an iframe, as I have another html document in it, with its body divided in columns, but I'm just showing the first one. The point of all this is that, after swiping, it should show the next/prev column, and I tried scrolling the iframe window or the inner's html body, which actually works in chrome, but it doesn't in iPad.

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• n*n blocks and polygons

  - by OSaad

  Hi, this is actually meant to be for a function called roipoly in matlab but it can be considered a general case problem. Roipoly is a function which lets u select a polygon over an image, and returns a binary mask where u can use it to get indices of the desired polygon. (It is just a normal polygon after all). My application (K-Nearest Neighbor) requires that i make n*n blocks out of the data i have (the polygon), i.e. If i have a polygon (a road or a piece of land), i want a n*n square moving over it while avoiding intersection with edges and putting those n*n pixels into some variable. This problem would be a lot easier if i had all my shapes in the form of rectangles, but that unfortunately isn't the case. I might have something going diagonal, circular or just irregular.

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• Displaying "broken" sprites?

  - by Roman

  I'm quite new to the world of 2D-Engines. I figured out how to load images and display those as sprites and stuff, but theres one question that bugs me. For instance, when a "rocket" hits an object it will deal damage to it and leave a crater behind. I'd like to have the crater shown on that object. That would require "skipping" some of the pixels of that image when rendering, doesn't it? My question is, how would you do such a thing? What data strcture would you use to save this? How to display a "broken" sprite?

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• Cell padding within inline CSS

  - by GregH

  I have a table within a div (see below). How do I add a right padding of say 30px to each cell/column within the table in that div? My understanding is that I have to use inline CSS? Basically, I want each cell to be padded on the right by 30 pixels. <div id="ddTopMenu";> <table border="0" > <tr> <td width=100></td><td >Dictionary</td><td>Search</td><td>Sources</td><td>References</td> </tr> </table> </div>

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• Binding to an ObservableCollection of UserControls

  - by nlawalker

  Simple Silverlight question: I have an ObservableCollection<MyObject> in my viewmodel. Every MyObject has a Label property. If I bind a ListBox to the collection and set DisplayMemberPath to Label, or set the ItemTemplate to a TextBlock that binds the Text property to Label, all works as expected. If I change MyObject so it derives from a UserControl, the Label text no longer shows up in the ListBox; each item just shows up as a blank strip a few pixels tall. Why is this? There's obviously something I'm missing here about how different things get rendered.

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• Custom component creation - how to add small icon representing component in Tool Palette?

  - by Wodzu

  Please bear in mind that I've read all the instructions I could find about adding component icon to my custom component. And I am able to do this when we talk about the icon size which is 24x24 pixels. I see the icon when a component is dropped on the form. However I can not see the small 16x16 icon which should be displayed when browsing Tool Palette. I've read that I should name my two other BMP files which are contained in DCR file like this: MyComponentName16 [for 16x16 BMP file] MyComponentName32 [for 32x32 BMP file] Unfortunately this does not seem to work, I've tried to restart Delphi few times in hope that it might be the case of not refreshing something, but without any success. Any ideas?

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• Java: BufferedImage from raw BMP file format data

  - by Victor

  Hello there. I've got BMP file's raw pixels table in byte[], it's structure is: (b g r) (b g r) ... (b g r) padding ... (b g r) (b g r) ... (b g r) padding Where r, g, b are byte each, padding is to round row length up to a multiple of 4 bytes. So, how can I create new BufferedImage from this raw data without copying, just using this raw data? I took a look at creating BufferedImage from DataBuffer, but I just didn't get it. Unfortunately ImageIO is not allowed in my situation.

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• Resizing an image with alpha channel

  - by Hafthor

  I am writing some code to generate images - essentially I have a source image that is large and includes transparent regions. I use GDI+ to open that image and add additional objects. What I want to do next is to save this new image much smaller, so I used the Bitmap constructor that takes a source Image object and a height and width, then saved that. I was expecting the alpha channel to be smoothed like the color channels, but this did not happen -- it did result in a couple of semitransparent pixels, but overall it is very blocky. What gives? Using img As New Bitmap("source100x100.png") ''// Drawing stuff Using simg As New Bitmap(img, 20, 20) simg.Save("target20x20.png") End Using End Using Edit: I think what I want is SuperSampling, like what Paint.NET does when set to "Best Quality"

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• size of an image

  - by Mike

  From times to times I have to know the width and height of images. I am using the following code: UIImage *imageU = [UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"myImage.png"]]; CGFloat imageW = CGImageGetWidth(imageU.CGImage); CGFloat imageH = CGImageGetHeight(imageU.CGImage); My question is that if it is there any other way to know the width and height of an image, in pixels, without having to load the image on a variable, that's probably consuming memory. Can the dimensions be read from the file directly without loading the whole image? thanks.

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