Often a screen grab can quickly get your point across and/or clarify your meaning, while saving far-more than a thousand words.
This article describes how to make simple screen grab images, and post them to Experts Exchange. I've also included some criteria you might consider when choosing an image format.
[step="1"title="Copy Screen to Clipboard"]
To copy the entire screen to clipboard, just press and release the Print Screen key (on the top row next to the Scroll Lock key on most keyboards).
To copy only the selected window (i.e. the window with 'focus') to clipboard, hold down an Alt key and press & release Print Screen, then release the Alt key.[/step]
In 'keyboard shorthand' the latter process is usually abbreviated as ''Alt+Print Screen'' (e.g. refer to the keyboard shortcuts on the right-hand side of File/Edit/View/etc drop-down menus).
2. Open Image Editor
Click on Start->All Programs->Accessories->Pai
nt (or open your favorite paint program).
3. Transfer Clipboard Contents to Editor
Do Ctrl+V, or click the Edit->Paste menu command, to 'dump' the clipboard data into an image container. Crop and/or edit to suit.
Here are some data to consider when choosing the format in which to save your image.
BMP is ''BitMaPped'' so a 24-bit BMP uses 24-bits to map the color of each and every pixel onscreen. There are 8-bits in a byte, so that means 1 pixel = 3 bytes in 24-bit BMP.
Typical screen resolution these days is 1024 pixels wide by 768 pixels tall. 1024 x 768 = 786,432 pixels. Times 3 = 2,359,296 bytes just for the pixel information of a 1024xd768x24bpp (bits per pixel) bit-mapped screen capture. Yes, 2+MBytes!
That's completely lossless, but also completely uncompressed, and typically a huge waste of hard drive space (and bandwidth) to store (and transfer) images in the BMP format. Even 16-bit BMP's use 1.5+MB for a 1024x768 image.
PNG is Portable Network Graphics, which is a 24 to 48-bit (true color) format featuring lossless compression, gamma and color correction, and - best of all - it's free. PNG's been an ISO standard since 2004.
It was developed shortly after Unisys and Compuserve started (in January 1995) charging royalties for any program that made use of the the 8-bit (256-color) Graphics Interchange Format (aka GIF).
JPG already existed at that time, but JPG does not have lossless compression... and 'heavy' use or reuse results in major visible artifacts near edges of object in the image (e.g. when compression of more than 5-10% is applied).
Yes, if you crank up the compression factor on JPG, you can make them smaller than PNG images, but I guarantee the PNG image's contents will look better in that situation.
Internet Explorer has had native display support of PNG images since v4.01 (IE 6.5 was released before MS finally licensed AOL code from IE 4.01 and later so the AOL browser was able to display PNG files, by the way).
Firefox has always had native PNG support; Netscape had it from version 4 until its demise; all other currently supported browsers I'm aware of have native PNG support.
TIFF (''Tagged Information File Format'') is another image format, and while it supports lossless compression, most TIFF (or TIF) files do not use any compression, resulting in very large files.
Patents on the TIFF image format are owned by Adobe, so while it's currently free to distribute files in that format, they could easily decide to start charging royalties on display/editing programs just as Unisys/Compuserve did with GIF.
Anyway... with lossless compression, widespread support (including here on EE), and its 'public domain' status meaning you won't ever have to pay royalties to use that format, PNG appears (to me, anyway) as the obvious choice to use when saving your screen grabs as well as other images.
4. Select the Screen Grab's Image Format
Click on File->Save As... in the Save As window click down arrow on the Save as Type picklist (immediately below the File name line) where it says ''24-bit Bitmap (*.bmp;*.dib)'', and change that to ''PNG (*.PNG)''
5. Name and Save
Give your screen grab a filename (besides ''untitled'') which identifies and helps you classify (and to later find) it. e.g. VistaBSOD6304, DevMgr-Error, WirelessNoConnect, et cetera. The extension will be added automatically when you click the Save button.
If the computer you're on is currently marooned without internet access, copy the file across the network (wired, wifi, bluetooth, infrared, et cetera) or to a USB thumb drive, memory card, CD-RW, DVD-RW, or [gasp!] floppy disk and transfer it to a device that can access EE.
Now you're ready to post the image.
6. Open a New Question or the Replying Thread
In a question or reply, below the Comment field, check the Attach File box.
7. Add File
Click the Add File button that appears, then in the Choose File dialog browse to the location containing your screen grab, select the file and click Open.
Add a short description (keep in mind this description should also appear as the 'alt text' when the cursor is floated over the image, for browsers with that option enabled, or in place of the image if the browser is configured not to display images).
9. Add File, or Finish
Next you can click Add File to attach another file (up to the 5MB limit), or finish your Comment and click Submit.
If you change your mind, you must click the 'REMOVE' link above the description field... unless they've changed how that works recently, just unchecking the Attach File box after uploading the file does NOT unlink the attachment from your Comment.
I hope you found this article useful. If so, please let Experts Exchange know by using the link in the upper-right corner of this article; If you have any information you'd care to add, you can also leave a comment below.