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Photo Forum / Digital Photography / DSLR Cameras / July 2009reducing megabites
Hi, I've replaced recently my 5 MP Camera with the 10 MP one. Shots made by new camera occupy significantly bigger memory. For e-mailing purposes, I would want to reduce it sometimes (by decreasing number of pixels or whatever). How can I do this, with which photo editor? Thanks M. >Hi, >I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] >Thanks >M. Pretty much any of them. Resize the image and save it with a new/ammended name so as not to lose the original. For handiness, I might suggest Irfanview. But whatever you're using to view them now may be able to do it. > Hi, > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made > by new camera occupy significantly bigger memory. For e-mailing > purposes, I would want to reduce it sometimes (by decreasing number of > pixels or whatever). How can I do this, with which photo editor? Photoshop (Elements, CSn) The Gimp (freeware) many others. Save as a different name. Resize (640 - 1200 pixels wide by 400 - 800 pixels high (in those ranges) is typical for e-mailing and web display. (View at 100% to be sure what you're sending). Save the JPG as quality 7 or 8 is usually sufficient and also reduces the file size. Again, keep your original image files separate. -:On 02-07-09 22:32, mike wrote: -:> Hi, -:> I've replaced recently my 5 MP Camera with the 10 MP one. Shots made -:> by new camera occupy significantly bigger memory. For e-mailing -:> purposes, I would want to reduce it sometimes (by decreasing number of -:> pixels or whatever). How can I do this, with which photo editor? -: -:Photoshop (Elements, CSn) -:The Gimp (freeware) -: -:many others. -: -:Save as a different name. -:Resize (640 - 1200 pixels wide by 400 - 800 pixels high (in those -:ranges) is typical for e-mailing and web display. (View at 100% to be -:sure what you're sending). thumbs plus will do a batch resize. -: -:Save the JPG as quality 7 or 8 is usually sufficient and also reduces -:the file size. -: -:Again, keep your original image files separate. -: -: -: > -:On 02-07-09 22:32, mike wrote: > -:> Hi, [quoted text clipped - 14 lines] > > thumbs plus will do a batch resize. So will Photoshop Elements and CSn (and many others, I 'spect). Thanks to all for your comments. Does resizing always mean I get smaller frame, or it may stay approximately same only with lower pixels density? M. > Thanks to all for your comments. > Does resizing always mean I get smaller frame, or it may stay > approximately same only with lower pixels density? Re-sizing means the image is "sampled down" so that a lot of information is thrown away. Displays present the image at about 90 - 100 pixels per inch - that dictates the on screen physical dimension. For example if the original is 3888 x 2592 pixels and you reduce it to 1200 x 800 then over 9M pixels (90%) are thrown away... (another reason to always work from copies...). (Printers go 240 - 360 dots per inch, so a given image always prints a lot smaller - why you edit prints at larger dimensions). > Does resizing always mean I get smaller frame, or it may stay > approximately same only with lower pixels density? It depends completely on the displaying unit. If you are using a program (or a digital photo frame, or a printing preprocessor or a whatever) that's set to display the image at a given size (fill the frame, the screen, the paper, for example), you should get the same frame size every time. It may even mean that the progran has to upsize the image (sometimes you have to click a checkbox to allow this), as the physical pixels the unit (screen, LCD, printer, ...) uses stay at the same size, and need to be told what to show. Of course that means your digital photo frame of, say, 800x600, has to downscale a 10 MPix image *a lot. Which takes a moment of time and may result in a slightly worse image displayed than if you gave it an 800x600 image yourself. If your displaying unit is set to show your image at a certain percentage (25%, 33%, 100%, ...) of the original size, then the frame size will differ. This is sometimes used with some programs showing your image on the computer screen, usually to edit it. -Wolfgang > Hi, > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] > Thanks > M. I'm sure you can do this in the camera... this will save you alot of time the post production phase. >> I've replaced recently my 5 MP Camera with the 10 MP one. Shots made >> by new camera occupy significantly bigger memory. For e-mailing >> purposes, I would want to reduce it sometimes (by decreasing number of > I'm sure you can do this in the camera... this will save you alot of > time the post production phase. I'm sure that emailing isn't the only reason to shoot the images. -Wolfgang >>> I've replaced recently my 5 MP Camera with the 10 MP one. Shots made >>> by new camera occupy significantly bigger memory. For e-mailing [quoted text clipped - 5 lines] >I'm sure that emailing isn't the only reason to shoot the >images. Agreed. I have my camera set to store JPEGs at 2MP, along with full-rez raw. The JPEGs are handy for quickly reviewing shots, sending snapshots to family, and "auditioning" effects and edits before applying them to the full size image. This interesting page illustrates, though, that for a given target file size, increased compression will retain more detail than reduced resolution: http://www.wfu.edu/~matthews/misc/graphics/ResVsComp/JpgResVsComp.html >I've replaced recently my 5 MP Camera with the 10 MP one. Shots made >by new camera occupy significantly bigger memory. For e-mailing >purposes, I would want to reduce it sometimes (by decreasing number of >pixels or whatever). How can I do this, with which photo editor? <canned answer #2> To reduce the file size of a picture you can - reduce the dimensions of the picture - increase the JPEG compression of the picture Both operations are standard features of any photo editing software. How to execute them depends on what photo editing software you are using. </canned answer #2> Some email programs even ask if they should reduce the size of an attached picture for you. BTW: I seriously hope you don't have megabites. That would be a thousand times worse than the Chinese torture of the thousand cuts. jue > Hi, > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] > Thanks > M. For Windows XP, you can use the "Image resizer" powertoy, which lets you resize your pictures (or create a resized copy) from the right-click menu in the explorer: http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx There are clone Vista versions (google for "image resizer powertoy")  SignatureBertrand > Hi, > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] > Thanks > M. If you are using Windows XP, you can select the pictures in Explorer and use the 'Email this file' icon in the 'File and Folder Tasks' panel. This will ask you whether you want to send smaller images or keep the original file size. A 10 Mp image (3648x2736) was reduced to 640x480 and the file size was reduced from 2.5Mb to 61kb. > > Hi, > > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 9 lines] > size. A 10 Mp image (3648x2736) was reduced to 640x480 and the file size was > reduced from 2.5Mb to 61kb. Bingo. Finally a correct answer. It reduces it without damaging the original and doesn't take any additional time/effort. >Hi, >I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] >Thanks >M. You can use Irfan View, which will also let you view, thumbnail, and even crop your photos. It's free. www.irfanview.com You can re-size them if you want, and you can select the compression rate of the jpeg when you save it. For E-mail, usually you re-size to about 1000 pixels wide, or whatever your monitor is, and you set the save compression factor to "5" or so. >>Hi, >>I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 14 lines] >For E-mail, usually you re-size to about 1000 pixels wide, or whatever your >monitor is, and you set the save compression factor to "5" or so. It also has a feature that lets you target (approximately) a file size in bytes to automatically set an image's compression accordingly. I tried the feature when it was first added, but I'm not sure it's compatible with all the other JPEG saving options. I haven't tried it in the latest release, though. >>>Hi, >>>I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 20 lines] >compatible with all the other JPEG saving options. I haven't tried it >in the latest release, though. I didn't have that feature when I wrote the post, so I went and got the latest version. One thing they added that I like is the 'rotate any angle' command, very useful! [] > You can use Irfan View, which will also let you view, thumbnail, and > even crop your photos. It's free. [quoted text clipped - 7 lines] > whatever your monitor is, and you set the save compression factor to > "5" or so. IrfanView also has the nice feature that you can do a lot in batch mode, so processing an entire directory of photos automatically is easy. Cheers, David > Hi, > I've replaced recently my 5 MP Camera with the 10 MP one. Shots made [quoted text clipped - 3 lines] > Thanks > M. Maybe you have one of those apples or something, but on my PC (XP Pro) if you select jpeg images in Windows Explorer, right click and select "send to" -> "mail recipient" then a little box comes up giving a choice of "make images smaller" or "keep original size". Simples... Typically a 3Mb 2k X 1k5 (QXGA) camera jpeg (90% compressed from ~10M8b to ~1M1b) will be reduced 95% to 640X480 (VGA) jpeg (96% compressed from 1M3b to 54kb). I suspect it always tries to reduce to VGA. |
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