I have been asked to supply a fairly large number of colour and bw images that are presently Adobe RGB(1998) files that are destined for use in a digital projector. What would it be best to convert these files to before sending. I've done some reading and sRGB is mentioned in some instances but not in others - I'd like to be sure. The videographer putting the show together can't be contacted and I have no previous experience with this.
Reg:
Here's what I do for images destined for Powerpoint:
If you know how much space your image will appear on screen, then use that as a starting point. I don't know what your client has for a laptop, but for the most part, the resolution is typically limited on the projector end.
The vast majority at present are 800 x 600 pixels. The models only a year or two old may be 1024 x 768 pixels. There are a very few models out in the last year with a scooch more resolution, but whether or not you will see is a gamble.
If using a mac laptop, then go for 72ppi at the portion of the screen you intend to use, factoring in whether the image is horizontal or vertical.
For example, the maximum a 35mm original (2 x 3 aspect ratio) could be as a vertical image (assuming no cropping) is 600 pixels high, thus 400 x 600 pixels is just fine and dandy.
If you have a 35mm original scan that is for full screen (uncropped) then about 533 x 800 pixels. If you can crop then go for 600 x 900 knowing that one side or the other (or a portion of both) will have to be cropped off or downsampled).
Take your color managed files, and convert to sRGB (satanic RGB). If you have access to a LCD projector, try making a few images in a "ring-around" and view them projected in a semi-darkened room.
I go with the values on my "digizone chart" (click on the digizone link at http://www.riecks.com/digitalinfo.html), roughly about 10, 10, 10 for blacks with minimal detail, and about 247 to 250 in all three channels for a bright white (specular highlights can go a bit higher).
I work in colormatch rgb for most files (lots of legacy files, like the way they look, and am "set in my ways") and have an action that I use for "web prep." I find that the straight conversion to sRGB leaves me with a slightly "dull" image, so I do the following.
-Duplicate layer
-Convert Layer Mode of duplicate layer to "multiply"
-Set opacity of duplicate layer to 10 percent
-Optional (if necessary, double click on dupe layer, use the "blend if gray" "this layer" sliders so that the darkening affects shadow areas only).
-Flatten
-Apply a global "saturation" using the "hue/saturation" command to all channels of about 5 percent.
-Optional - apply "tiny" amount of USM, or use another custom sharpening action*)
-Save image as uncompressed TIF
-Save as a maximum quality Jpeg
The TIFF is a fallback incase I want to add text over the image (increase saturation, etc) and avoid a second round of Jpeg compression.
If you only have high res files to start with, the downsampling routine I describe on my controlled vocabulary site might be something you want to try (http://www.ControlledVocabulary.com/imagedatabases/downsampling.html).
So while this is certainly not "Powerpoint image prep for dummies" lets just affectionately refer to it as "Powerpoint image prep for the Anal Rententive" amongst ourselves? ;-)
Hope that helps.
David
David Riecks (that's "i" before "e", but the "e" is silent) [EMAIL PROTECTED] http://www.riecks.com/ Midwest/Chicago ASMP * ph/fax 877-646-5375
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