You can learn a lot about an image by opening it up, and going to the image menu and choosing image size. And this will give me some very important information, namely the exact pixel count as well as its width and height and resolution. Now you know that a pixel based raster image is made from a grid of pixels, and the more pixels there are in the image the larger the image file. This picture (which came from my digital camera) has 1600 pixels along the width and 1200 pixels along the height. Its document size is been programmed to be 5.3 inches by 4 inches at a resolution of 300-pixels. These three values, width and height times resolution, gives me this file size 5.5 megabytes because it's an RGB image. The other way to get to this value is multiplying these pixel dimensions. 1600-pixels by 1200-pixels in RGB will give me of course the same information. Because this information is this information down here. Well one reason why I might bring this up, this dialogue box up that is, is to do something I often do. That is, down res this type of image to make it small enough to be easily emailed to somebody, a friend say, as a JPEG file. My general rule of thumb is I don't like to send pictures, which are larger than 100 kilobytes in size. So what I might do is stick with this dimension, 5.3 by 4 but for resolution I'm going to type in 72-pixels, and making sure that resample image is enabled - because if it's not, it won't throw out any pixels. But I've told it to reduce the resolution from 300-pixels to 72. And now if I look at the top of my image size dialogue box, I can see my new pixel dimension when I click ok will be 324k, much smaller file and of course that's because I'm throwing out quite a lot of pixels. I'll click ok to that, and you can see my files shrinks down considerably. I'm going to double click on my zoom tool to see my image one to one. That is 1 image pixel for 1 screen pixel, so that's exactly how it will look on a computer monitor at 100% resolution. You may have noticed that it did not quite shrink down to 100k or less. Well the next stage if I were planning to send this out as an email attachment would be to save for web, and choose the JPEG format, and choose one of these resolution or compression options. So that it essentially looked good, so there weren't too many JPEG artefacts, but made it under the 100 kilobyte limit. And I could see that even at the highest compression my kilobytes are only 62.5 kilobytes in size. So this will be compressed down nicely to be emailed to a friend of mine. I'm going to undo that, so I'm back to my original resolution, and talk a little bit more about image resolution. Just as you can shrink down your file by changing the resolution here, I could also increase my file size. So if I typed in 600 here, my file will balloon from 5 1/2 megabytes to 22 megabytes. Now what Photoshop would be doing is adding pixels to my image. And what it's going to do - it's going to resample by adding pixels to my image and re-sampling up, or that's also known as resing up or up-resing. Another fun and interesting feature you can use this way is to actually choose or disable constrain proportions. Notice when constrain proportions is enabled, there is this chain icon here, indicating that if I make a change on one of these dimensions a change will be made on other dimension because my proportions have been constrained. So if I make my height 5 inches, my width will increase. And conversely if I decrease my width to 3 inches my height will decrease. So the document's height to width ratio is not changed at all, just the amount of pixels that make up the image. Well one option that you have of course is to disable constrain proportions and create an interesting effect. So I'm going to choose width and make this a square image. So now my width will be compressed. And for what it's worth, it is indeed throwing out some pixels. So my file size will be a little bit smaller. I'll zoom-out to see that effect, I'm going to undo that, and just talk a little bit more about some rules that you should consider when doing things with file size or image size. Generally it's much safer to throw out pixels by down resing. So if I were to reduce the resolution to 150 pixels per inch, I would be throwing out every other pixel. And if I were to have down res this a lot, it'd still be ok. However if I start off with a small file like this and then upres it, the general rule of thumb is do not upres more than 50% of your original image size. And for good reason, because it's very much like taking a very small negative and making a gigantic print. You'll immediately begin to see image resolution problems. Because there wasn't enough data to start with, so if I take my new small image and res it up say 300%, I'll just go up here to my percentage area and type in 300%, what I begin to get is a soft and fuzzy picture - because my image didn't have enough pixel information to start with. So you can res up a little bit or res down a fair amount. But essentially if you are making your images more than 50% larger than the original image, you should probably start with a better scan. Or a larger image from the very beginning, because there just isn't enough pixel information to create a decent output. So that's the general rules of thumb with image size.
TERMS & CONDITIONS OF USE
BY SUBSCRIBING TO THIS SERVICE, YOU ARE CONSENTING TO BE BOUND BY AND ARE BECOMING A PARTY TO THIS AGREEMENT, THE TERMS AND CONDITIONS OF WHICH SHALL PREVAIL IN GOVERNING YOUR RIGHTS OF USE. BY CLICKING THE "BECOME A MEMBER" BUTTON, THE INDIVIDUAL OR ENTITY LICENSING THE PRODUCT ("YOU") IS CONSENTING TO BE BOUND BY AND IS BECOMING A PARTY TO THIS AGREEMENT. IF LICENSEE DOES NOT AGREE TO ALL OF THE TERMS OF THIS AGREEMENT, THE BUTTON INDICATING "BECOME A MEMBER" MUST NOT BE SELECTED, AND LICENSEE MUST NOT INSTALL OR USE THE SOFTWARE.
"VTC" refers to Virtual Training Company,
"You" refers to the user or subscriber.
"Software" refers to the VTC training content and software.
2. LICENSE: VTC hereby grants to You a worldwide, non-royalty bearing, non-exclusive license to use the Software according to the provisions contained herein and subject to payment of the applicable subscription fees.
3. RESTRICTIONS: You may not do any of the following:
Save the Software to Your hard disk or other storage
medium; permit others to use the Software except as specified by addendum;
modify, reverse engineer, decompile, or disassemble the Software; make
derivative works based on the Software; publish or otherwise disseminate
the Software. VTC, Inc., VTC Online University, and the Virtual Training
Company site is owned and operated by VTC, Inc. as a corporation of
All materials on this site are the property of VTC unless otherwise specified. No material from these pages may be copied, reproduced, republished, downloaded, uploaded, posted, transmitted, or distributed in any way. Modification of the materials or use of the materials for any other purpose is a violation of U.S. copyright law and other proprietary rights. For purposes of this Agreement, the use of any such material on any other web site or networked computer environment is prohibited.
4. FEES: The rights granted under this Agreement
are effective only upon payment of the subscription fees, which are
strictly non-refundable other than as expressly provided herein. The
term "monthly subscription" is defined as any 30 day period.
The term "yearly subscription" is defined as one 365 day
period. A yearly subscription ends on the same numerical date as it
began (example July 28, 2004 to July 28, 2005).
The VTC Online University is access to every VTC training tutorial in our library. You pay a flat fee for access to these titles. You are billed according to your renewal selection below, and can renew monthly, yearly, or in any other increment offered. If you choose to be billed monthly, you will be billed every 30 days for the subscription until you request the subscription be cancelled. Our terms of service state that you must cancel a monthly subscription at least two business days before your renewal date. These two days give us enough time to ensure that you will not be charged again.
5. LIMITED WARRANTY: VTC warrants that the Software, if operated as directed, will substantially achieve the functionality described. VTC does not warrant, however, that Your use of the Software will be uninterrupted or that the operation of the Software will be error-free or secure. In addition, the security mechanisms implemented by the Software have inherent limitations, and You must determine that the Software sufficiently meets Your requirements. VTC also warrants that the media containing the Software, if provided by VTC, is free from defects in material from the date You acquired the Software. VTC's sole liability for any breach of this warranty shall be, in VTC's sole discretion: (i) to replace Your defective media or Software; or (ii) to advise You how to achieve substantially the same functionality with the Software as described; or (iii) if the above remedies are impracticable, to refund the subscription fee You paid for the Software. Only if You inform VTC of Your problem with the Software during the applicable subscription period will VTC be obligated to honor this warranty. VTC will use reasonable commercial efforts to repair, replace, advise, or refund pursuant to the foregoing warranty within thirty (30) days of being so notified. If any modifications are made to the Software by You during the warranty period; if the medium is subjected to accident, abuse, or improper use; or if You violate the terms of this Agreement, then this warranty shall immediately terminate. This warranty shall not apply if the Software is used on or in conjunction with hardware or software other than the unmodified version of hardware and software with which the Software was designed to be used as described.
THIS IS A LIMITED WARRANTY, AND IT IS THE ONLY WARRANTY MADE BY VTC OR ITS SUPPLIERS. VTC MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF THIRD PARTIES' RIGHTS. YOU MAY HAVE OTHER STATUTORY RIGHTS. HOWEVER, TO THE FULL EXTENT PERMITTED BY LAW, THE DURATION OF STATUTORILY REQUIRED WARRANTIES, IF ANY, SHALL BE LIMITED TO THE ABOVE LIMITED WARRANTY PERIOD. MOREOVER, IN NO EVENT WILL WARRANTIES PROVIDED BY LAW, IF ANY, APPLY UNLESS THEY ARE REQUIRED TO APPLY BY STATUTE NOTWITHSTANDING THEIR EXCLUSION BY CONTRACT. NO DEALER, AGENT, OR EMPLOYEE OF VTC IS AUTHORIZED TO MAKE ANY MODIFICATIONS, EXTENSIONS, OR ADDITIONS TO THIS LIMITED WARRANTY.
6. PROPRIETARY RIGHTS: VTC reserves all proprietary rights in and to the Software, is protected by copyright and other intellectual property laws and by international treaties. VTC, Inc.
Trademark Notice: VTC, Virtual Training Company,
Inc., The VTC Logo, and VTC Online University, are trademarks of VTC,
Inc. All other company and product names may be trademarks of their
The information contained herein is subject to change without notice. Copyright © 1995 - 2005 VTC, Inc. All rights reserved.
7. TERMINATION: This Agreement shall automatically terminate if You fail to comply with the restrictions described herein. Your obligations to pay outstanding subscription fees shall survive any termination of this Agreement.
8. LIMITATION OF LIABILITY: UNDER NO CIRCUMSTANCES
AND UNDER NO LEGAL THEORY, TORT, CONTRACT, OR OTHERWISE, SHALL VTC
OR ITS SUPPLIERS OR RESELLERS BE LIABLE TO YOU OR ANY OTHER PERSON
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF
ANY CHARACTER, INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL,
WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER
COMMERCIAL DAMAGES OR LOSSES. IN NO EVENT WILL VTC BE LIABLE FOR ANY
DAMAGES IN EXCESS OF THE AMOUNT VTC RECEIVED FROM YOU FOR A LICENSE
TO THE SOFTWARE, EVEN IF VTC SHALL HAVE BEEN INFORMED OF THE POSSIBILITY
DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH OR PERSONAL INJURY RESULTING FROM VTC'S NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.
9. Links To Other Materials: Linked sites found at the VTC site are not under the control of VTC, and we are not responsible for the content of any linked site or any link contained in a linked site. VTC may change links based solely on our discretion, and we reserve the right to terminate any link or linking program at any time. VTC does not, by linking to sites, endorse companies or products to which it links and reserves the right to note as such on its web pages. If you decide to access any of the third party sites linked to this site, you do this entirely at your own risk.
Forums, and Chat are not always screened by VTC, and we are not responsible for the content of any public or open forum content at the site. VTC may change these public forums based solely on our discretion, and we reserve the right to terminate any forum at any time. VTC does not, by allowing these forums, endorse companies or products which may be mentioned in these forums, and reserves the right to note as such on its web pages. If you decide to access any of the public forums in this site, or linked to this site, you do this entirely at your own risk.
9. GOVERNING LAW & DISPUTE RESOLUTION: This Agreement is governed by Virginia law. All disputes between You and VTC shall be finally resolved through arbitration in Winchester, Virginia. This site is controlled by VTC from its offices within the United States of America. VTC makes no representation that materials in the site are appropriate or available for use in other locations, and access to them from territories where their content is illegal is prohibited. Those who choose to access this site from other locations do so on their own initiative and are responsible for compliance with applicable local laws. You may not use or export the Materials in violation of U.S. export laws and regulations. Any claim relating to the Materials shall be governed by the internal substantive laws of the Commonwealth of Virginia, USA.
VTC may revise these Terms at any time by updating this posting. You should visit this page from time to time to review the then-current Terms because they are binding on you. Certain provisions of these Terms may be superseded by expressly designated legal notices or terms located on particular pages at this Site.
If you have any questions regarding this policy,
or your information specifically,
you may email us at:email@example.com.