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Mostly just keep them as RGB. RARELY as grayscale.
I have one that I know projected horribly it was RGB, 10.5" x 8" @ 
150dpi.  (1600x1200 pixls).

Sure.
I appreciate your considerations.
L.
_____________________
Linda M. Feltner Artist LLC
Guild of Natural Science Illustrators, President
520.803.0538
www.lindafelter.com
On 4/11/17 1:56 PM, Karen Ackoff wrote:
> When you saved the pencil sketches, how did you save them? As 
> grayscale or RGB? Projectors are RGB and might have a problem with 
> grayscale? Just thinking out loud
> K
>
> PS Sorry I missed that you mentioned your MacBook and Powerpoint. I 
> was in hurry.
>
>> On Apr 11, 2017, at 3:54 PM, Linda Feltner-GNSI <[log in to unmask] 
>> <mailto:[log in to unmask]>> wrote:
>>
>> Thank you, Karen.
>>
>> I did mention that I used my own MacBook Pro, and Powerpoint.
>> In one case where my computer failed, I used the backup on a flash 
>> drive, and the museum had a non-mac PC, Powerpoint ran directly off 
>> the flash drive and all was fine.
>>
>> I did try changing every option for resolution settings on the 
>> computer. I could not access the projector's resolution settings, nor 
>> did the Tech Support person try as an option.
>>
>> I don't use PDF files normally. But if I do, I'll make sure to turn 
>> off compression and downsampling.
>>
>> The images were scanned at 600ppi, and reduced to 300 or 150.
>> The images were not screenshots or made from screenshots.
>>
>> The color images of paintings projected just fine. It was just the 
>> black and white pencil sketches. It is a mystery.
>>
>> Thanks so much!
>> Linda
>>
>>
>>
>>
>> _____________________
>> Linda M. Feltner
>> Guild of Natural Science Illustrators, President
>> 520.803.0538
>>
>>
>>
>> On 4/11/17 1:39 PM, Karen Ackoff wrote:
>>> Images these days, even 150 dpi should look decent when projected.
>>>
>>> A couple of things come to mind…
>>>
>>> Were you projecting from a Mac?
>>> Powerpoint?
>>> Did you move the Powerpoint presentation back and forth between Mac 
>>> and PC?
>>> If you are not using Powerpoint, what program are you projecting from?
>>> Were the images scanned?
>>> Did you by an chance use a screen shot you made of them sometime 
>>> along the way?
>>>
>>> The only other thing might be the resolution settings on the 
>>> computer and/or the projector. In general, projectors are somewhat 
>>> lower res (this is changing). But if you are on a Mac, when plugged 
>>> into a projector, you can to to System Prefs > Displays and choose 
>>> resolution settings for both computer and projector. The defaults 
>>> sometimes are awful, and so I often change these settings.
>>>
>>> If you are using screen shots (these would be PNG files) and you are 
>>> projecting from a PDF… sometimes images don’t translate very well 
>>> and appear low res. Assuming you are NOT using screen shots, but if 
>>> you ARE using a PDF, you might want to check your PDF settings 
>>> before you save your document. There are a wide variety of settings 
>>> available for PDF files. If you want the highest resolution, under 
>>> OPTIONS, turn off compression and downsampling. The files will be 
>>> larger but will be of higher quality.
>>>
>>> Also… one other thought if you are using PPT. Try keeping the scans 
>>> that you import into PPT in the same folder (on the same directory 
>>> level) as the actual PPT file). You shouldn’t have to, but you never 
>>> know. Also try reimporting those files into PPT, and see if that 
>>> makes any difference. Videos, in particular, are problematic and are 
>>> linked not embedded (a problem when switching btwn Mac and PC). 
>>> Images should automatically be embedded, but as I said, you never know.
>>>
>>> Some things to think about.
>>>
>>> K
>>>
>>>
>>>
>>>> On Apr 11, 2017, at 3:22 PM, Linda Feltner-GNSI <[log in to unmask] 
>>>> <mailto:[log in to unmask]>> wrote:
>>>>
>>>> Hi All:
>>>> With your broad experience of digital projectors, I thought I'd see 
>>>> if you had any tips.
>>>>
>>>> I have shown a lot of Powerpoint presentations connected to my 
>>>> Macbook Pro and using a VGA connection.
>>>> I show images of my developmental pencil sketches as: RGB, usually 
>>>> 300dpi or 150dpi, and JPEGS or TIFFS. I now use Photoshop to deepen 
>>>> the drawing because some areas of the sketch can be very light and 
>>>> delicate. Not all auditoriums or classrooms are totally dark.
>>>>
>>>> On occasion, these drawings are projected as the most clunky 
>>>> bit-map-looking things, and to me, they just look awful. I've had 
>>>> IT folks say it's the projector, and others tell me they don't 
>>>> know, even after tweaking the aspect ratio for the projector 
>>>> comfort zone. Doesn't work.
>>>>
>>>> Is it totally the projector? or
>>>> Does anyone have any tips for planning for success?  PDFs? (I don't 
>>>> use those much in PPT). Grayscale ? CMYK?
>>>>
>>>> Your experience is very much appreciated,
>>>> Linda
>>>> -- 
>>>> _____________________
>>>> Linda M. Feltner
>>>> Guild of Natural Science Illustrators, President
>>>> 520.803.0538
>>>>
>>>>
>>>>
>>>> ________________________________________________
>>>>
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>>>
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