Yes, I believe the cheapest option for you would to be to create a "Softcover" using your colour photo and gold letters. You get a choice of paper, so you can choose Economy B&W, either cream or white. In the View menu of BookWright, near the bottom, there is a Book Pricing feature. Presuming you have set your country already in BookWright, it will allow you to price out options for your book in your own currency. You can even take out the Blurb logo on the back and see if your price changes. For a trade book, I believe the price shouldn't change.
Is there an option for colour on just the cover, all other pages being black and white?
The cover of the book I'm trying to make has a photograph and gold letters on the cover and back.
The rest of the book is black and white text.
It's a trade book, 6 by 9.
What would be the cheapest option for me?
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So, as I understand it, a black and white book will have a full color cover, back cover and spine. Is my assumption correct?
@piavaleriana, and those who want to improve their cover color
Yes, you are correct. You design each of those three as separate color images, then bring them into BookWright and position them the way you want them. For example, I had a horizon on a cover that I wanted to extend through the spine and back cover, so I made sure they each lined up in BookWright.
The color you see on your screen will likely not exactly match what your printed book cover shows. Order a single test book with a free ISBN and then adjust the color in your images. Here's a procedure you can use to get it close to the color you want.
Print you cover image on your printer using gloss photo paper (size does not matter). Make a version of your cover image just for printing and adjust your image until you get the printout colors to look the way you want it. Use that adjusted image (Adjustment 1) in BookWright and order a test book from Blurb. When you get the test book, the cover will likely not match your local printout of the Adjustment 1 print on gloss photo paper that you did initially. Place that printout on your scanner, along with your test book and scan them into a new image. Load that image into an image editor (Photoshop, IrfanView, PaintShop Pro, GIMP, etc.).
Some of the colors may be close enough for you to accept, but one or more other colors may be too different from each other. For example, a gold color on the book scan may be too dark, as compared to the scan of the printed photo. Use the color picker tool to measure the two versions of the same color, using the RGB setting (Red, Green, Blue). Using a calculator, find the difference between the Red components of the two versions, and write that down. Do the same for the Green and the Blue components. You will notice that one set of numbers you are examining is lower than the other. Usually, the printed book numbers are lower. Lower numbers are darker. That means you want to lighten up the color, by making the number larger. If you lighten the color in your image just the right amount, when you reload it into BookWright and order another test book, it will be much closer to your local photo print of your cover image. But how do you lighten it properly?
I have used the following method, and it works well for me. You can try it too and see for yourself. It is actually not just a lightening or darkening process. Each of the Red, Green, and Blue components of the color must be adjusted separately. To do that, you will be making an new color to replace the color you see in your cover image. Title lettering is a good example of a color you want to get just right. First you compose the new color, then you replace the old version of the color in your cover image with your newly created color. To compose the color, you use your calculator again and the color selector in your image editor. Individually set the values for RGB: Red, Green, and Blue. Take the existing color's Red component and ADD the difference value for Red that you calculated with the calculator earlier. Then take the existing color's Green component and ADD the Green difference value. Do the same for the Blue component. That is your new color.
This new color will likely look way to light and strange to your eye. Go ahead and use it to replace the old color. You can use various tools in your image editor to do that. You can save this (Adjustment 2) image version with a new name that says it is only for the printed book version. Indeed, if you are doing an eBook version, you want to use the original version of the image that looked good on your screen. This new version will look good only once it has been printed by the Blurb book printing process. Even then, you may want to tweak it again, although I was fine with the first round of revision.
Hope this helps you.