09-10-2011 11:22 AM
.jpg is a file format - RGB means Red / Green / Blue this is the color style of the image. Lulu perfers this over CMYK - Cyan / Magenta / Yellow / Black
If you are using CMYK then your colors will look different when they are translated to RGB and vice versa.
09-10-2011 11:41 AM - edited 09-10-2011 11:43 AM
I have jpg image files in my ebook. What exactly do I need to do to make these images acceptable to lulu? Do I open the image in a program like GIMP and then resave it in rgb format? I read somewhere that rgb is not actually a format to save the file and png is accaptable? Is tha true? What tools will help me do this?
09-10-2011 11:50 AM
You just need to verify the colors of the .jpg.
.jpg is the file format and doesn't affect the colors.
Open your image and check the image information to see if it is RGB or CMYK for the colors. I don't do ebooks on Lulu - but have never had any problems with the ones I use for covers. Most non professional programs default to RGB.
09-10-2011 12:53 PM
I don't know your program - on my program I right click and then click on image information and it gives inmformation on a number of things including pixel depths / colors which on the one I'm currently working with reads - RGB - 8 bits channel
I use Corel Paintshop Pro 3x
You have something similiar in your photo editing program that allows you to edit the color channel or color depth of the photo.
09-10-2011 03:56 PM
Digital images are, by default, rgb. If you took the photos and didn't change the color mode using image editing software, then they are rgb. To verify, you can check the exif data or the color mode with most image editing software. How you do this depends on the software.
But it is highly unlikely the images are not rgb.