Hi,
Regarding your points, here are some ideas things come to my head;
1) If the designer insistes on doing all his design (graphic) in Photoshop,
what does he need to pay attention?
Answer:
1- Make sure that you do not resize the image files in Flash, use the exact
image size and if you like to resize an image, do it in Photoshop, otherwise ,
this may cause image distortion.
2- For solid colors, gradient, text...etc. or thing that you can do in Flash,
you can discard it form the Photoshop file and redo it in Flash to be
easy-to-edit and less in size in most cases.
3- Try to crop the unused spaces around the images.
2) If we want to make a small animation like a person walking, does he have to
save all the parts (like arms, legs, face, etc.) into different images and I
assemble them all in Flash? Is there any better way?
Answer:
I myself do not prefer using images in animated characters, as animating the
body parts will look distorted, you need to got the character as vector, either
getting it from the vector program or if your image is sharp enough to allow
you to trace it in Flash to convert it to vector.
But as a general concept, dividing the animated character as parts will help
animating the character more easier. The link Keer8R provided is one of the
best animation learining links, and also, here is a link for a great animator
and I am sure you will learn alot of him (by the way he is a regular
contributer in this forum, hope he sees you post

):
http://www.keyframer.com/
http://www.keyframer.com/
3) What file would be better? jpg? png? gif? or all the same?
Answer:
I used to use JPG for images without transperancy and PNG for transpernt
images, but if you have Flash CS3, you will have to worry about that, as you
can import the PSD file unsing the PSD import feature, which allows you to see
the PSD files and select what to import and what to discrad, get the transpert
the layer with reserving its transperancy, arrange the layers as frames or
layer and alot more..
If you are worry about the size you can set the quality of the imported images
from library by right-click the images and select properties. you can either
make the image take to same quality in the publish setting by choosing (Use
Document Default Quality), or set an individual setting for each image by
unchecking this option and set the image quality as you like. the less the
quality is the less the SWF file becomes.
4) Will this effect the file size?
answer:
I guess I answered this question within the previous answers
Hope this helps
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