Why do Photo size change when...

[nanc1]

<p>I looked everywhere and couldn't find anything on this topic, I apologies if I missed it.<br>

When you work on a photo why does the size of the photo decrease and not increase if your adding stuff or using filters on them or even adding a layered texture ?<br>

I've played with either JPEG or RAW.<br>

Thank You:)</p>

 

[craigd]

<p>I'm not sure what you mean. By "size" are you referring to the size of the file in megabytes, or the dimensions of the image in pixels? I would guess you mean the file size, because there's no reason the image dimensions should change unless you crop or scale the image. The file size may change for a variety of reasons depending on the format you save it in. JPEG has an adjustable setting for compression level, for example.</p>

[jcuknz]

<p>Are you talking about file size or what? What programme are you using? <br>

If you save as a jpeg it is possible some compression will take place to reduce the file size.</p>

[jcuknz]

<p>'Playing' in both PS CS and PSP thanks to your question I have discovered that depending on how I set the programme* I can either increase or decrease file size of the saved file. This is opening a file and saving it with a slightly different file name and then on going to open both files I hover the mouse over the name an get a read-out of the file size. In my case the original file is a jpg saved by the camera which gets bigger when openned to work on ... not sure on this but have assumed this for yonks. So I'm not sure if I know the answer to your question.<br>

*I had not explored this function in my PSP editor ... shame and smacked hand! :-)<br>

In PS you must have seen the slider which comes up in a second menu when you save as a jpg after first commiting to save as jpg and giving a file name.<br>

I am assuming that you usually click on a 'save' button instead of almost always using the 'Save As' command which prompts you for a file name and saving system. 'Save' is dangerous unless you know precisely why you are using it because it writes over the original file of that name. Some programmes have a button for each comand, while others require you to find 'Save As' in the 'File' menu... longer but safer.</p>

[indrajit]

<p>Nancy,<br>

If you are talking about the file size then probably you are saving the file in JPG/JPEG format. The RAW format stores much data about the picture taken than the jpg format like EV, White balance/color temp etc which gets merged in the jpg format and thus loses some data. Also, in JPG format, each pixel (each picture point for simplicity) is defined by 8 bit where as in raw, each pixel is defined defined by 16 bit data. So when you save a RAW file into JPG then automatically the file size reduces. Again. there are various compression level in JPG file format which reduces file size (sometimes loses some data). For a comparison on raw file format and JPG, you may follow wikipedia in this link "http://en.wikipedia.org/wiki/RAW_file_format".</p>

[nanc1]

<p>Hi Thanks everyone and I apologies for being so vague :( and yes File Size<br>

I use PSP X2 AND X4 and once i'm done editing it , I then 'Save As' and yes into JPG .....isn't that the only one to save it in for other people to be able to open it, view it and print from when I burn to a CD!?<br>

Some of my JPG are anywhere from 4.5MB and up and my RAW is 15MB and up but as soon as i do things and save into JPG theY go down to a 1.5MB and RAW as well, they all vary.<br>

I just started to work with RAW thinking my files will stay very large but most of them don't :(<br>

What format do you all save your work? for clients.</p>

[AJG]

<p>I'm not familiar with PSP, but in Photoshop Elements or CS5 when you save a file as a JPEG you have options as to how large a file you want to save. On the sliding scale you can save it as a 12 which is quite big, or as a 1 which is very small. This an adjustment for how much compression of the file you want, depending on the ultimate usage of the image. If you want the largest file and no compression, save it as a TIFF file instead of as a JPEG. This should also be compatible with almost any computer and should yield the highest possible quality from your original image. TIFF files will take longer to load and are overkill for e-mail and most website usage. </p>

[steven_f1]

<p>JPEG files are compressed while RAW files are not compressed. Say you have a lot of blue sky in a RAW picture that takes up 3MB of the file size. When you convert the file to JPEG the software looks at all the plue pixels and mathematically combines them in into a few numbers instead of the million numbers that would make up the information in the RAW file. As a result the JPEG file is smaller than the RAW. In many software packages you can tell the computer how much compression to apply just before you save the file. Not all files formats are the same RAW and TIFF files are not compressed. </p>

[Stock-Photos]

<p>Each time you edit and "resave" a jpg file, the image gets compressed more each time, reducing quality and file size.</p>

<p>Either use a non-destructive editor or convert your images to tif format before starting edits, then save to tif.</p>

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