I see in the Submission Requirements that images are supposed to be stored at 300 dpi, but as far as I can see this is not an attribute of JPG or GIF files. According to Irfanview, DPI is not an attribute of GIF files, and in the case of JPG files, it seems to have the format a x b, but Irfanview says it can be changed if desired. I typically set up my diagrams as JPG files, then convert them to GIF files, so I get the transparency feature for my web pages. I don't really want to have to store all diagrams in several formats :-)
If this is still a requirement, how do I set it - and on what ? Thanks in advance.
It has been a while since I used and uninstalled Irfanview, but . . .
DPI is misleading, commonly it means pixels per inch. But injkjet printers can talk about dots per inch and mean how many dots of ink per inch, or dpp as how many dots of ink per pixel. There are more meanings, but you get the idea. Assume, with caution, DPI means PPI, pixels per inch.
There should be a an image size menu. And in most image editing software you should be able to resize your image. Always work with a copy. Look at the resolution, for example 200 dpi. You can reset/resize the image to 300 dpi. But be careful:
I should add that GIF indexes colors and, depending on your art work, you could get banding. Again, depending on what the subject matter is, PNG can be a nice alternative to GIF.
DId I say, work with a copy? Always work with a copy.
Hope that helps.
Oops! So transparency is a no-no...? So, even though my PDF looks OK, the file could get rejected? I didn't mention in my query that I am using OpenOffice to create my PDF - I didn't think PDFs had any kind of transparency attribute - or DPI for that matter... I specify transparency on my GIF files so that the web pages (which my ODT file is built from) will look good.
Could you confirm that transparency could be a problem in this situation, in which case I will have to switch to embedding JPG files, which will be quite a bit of work!
Thanks in advance.
I didn't mention in my query that I am using OpenOffice to create my PDF - I didn't think PDFs had any kind of transparency attribute... I specify transparency on my GIF files so that the web pages (which my ODT file is built from) will look good.
You're right, Irfanview has a resize/resample option, and you can change the DPI - the default is 72. Also the default is to preserve the aspect ratio - but the resampling options are different: 6 options ranging from Lanczos (slowest) to Hermite (fastest). I tried doing a resample, and the file size did go up - so I guess that's what I need to do. However, none of the Irfanview displays actually gives the new DPI ( as far as I can see).
So, based on what you and Seal said, I should probably switch to using JPG files...?
Thanks in advance.
300 dpi is intended for continuous-tone images such as photographs.
If your diagrams are line art, you have an alternative, which is to include them as vector art. I did one book that had a few diagrams in it. They were made in Adobe Illustrator and then incorporated into an InDesign book.
When you export your odt file to PDF, you will get a screen that allows you to select a variety of things, similar to what you would get going from InDesign to Acrobat:
In the test I just ran, I could double click on the pdf file and it opened in Acrobat, BUT the icon was not a PDF icon, so I don't know if you would have troubles with this file and uploading it to CS.
How to check: if you have acrobat you can check in Advance>Preflight, but if you don't, then I would do this:
Keep all of your file for your project in one folder.
Keep & Name all of your manscript drafts in a folder so that you KNOW what is what
When you export your complete manuscript, Look at it carefully in Acrobate Reader or, better, Acrobat (but I'm assuming you don't have it). If it look good, but you are unsure of the images, open a navigation window to the image folder. In thumbnail view you can cursor over each image and the alt tag will show the px X px size; in detail view, you can see the file size. Look for anomolies. Ok, it's 2AM and you're nervious, open all the image in Irfanview and look at each one in Image>Information.
Perhaps there is a way to review the image specs in your PDF without Acrobat, I don't know, but I'm sure someone will tell you.