HI EVERYONE I have a show coming up April 18th in Tennessee and I'm printing around 50 portraits. I'm printing at Sam's Club because of the prices and because the color there was much better than the color at Costco (at least for these images). So I took them in RAW with my Canon Rebel. Then I convert them in PS-CS3 to Tiff files and do minor toning and exposure changes if necessary. I am always having to back up my files so I found some software that's called "Easy Batch Photo. I use this to convert the tiff to a jpeg.(I think all they can take at Sam's is a jpeg but hopefully I'm wrong). I keep the dpi at 300 and use the highest quality. When I print my tests in 4x6 everything is fine. Sometimes I need to desaturate the colors but they are good quality. When I print larger however, I start to get lines running down the photos and some really enhanced red and green tones.Everything looks blotchy and there doesn't seem to be a control because sometimes a photo will come out decent and then others come out all messed up. I use a Mac laptop with OS X. When I printed using jpegs I had converted in Photoshop, the color was drained in comparison to the ones I converted in the EasyBatchPhoto. My screen is displaying at Color LCD because I don't know (they don't either) Sam's Club's printer profile. I'm so lost. What should I do? What am I doing wrong? Is there a pro photographer that uses Sam's that can give me some tips? I have to get these all done by Monday and I can't afford to go to a prophoto shop.