Identifying the difference between a Giclee, a Serigraph and a Lithographs

 information from Art.com for the purpose of identifying a couple of pieces of art work that I have.

It is hard to identify the artist's name it looks like P.A. Cluzcary or Cluzcay but it may possibly also be Culzean. 

The first one was my grandfather's and the other 2 smaller ones I purchased at an estate sale. My grandfathers has a number 13/ 100 on the front and would seem to be a lithograph. The other 2 are not numbered but have serial numbers on the backing. 

Are there significant quality differences between a giclee, a serigraph and a lithograph?

In terms of resolution, a giclee print has the highest resolution and color range.

Giclee printmaking offers one of the highest degrees of accuracy and richness of color available in any reproductions technique. Gicl�e printmaking provides a luminosity and brilliance that represents the artist's original work better than any reproduction technique available today.

A serigraph is created when paint is 'pushed' through a silkscreen onto paper or canvas. A different screen is used for each color in the print, and this results in a print with great color density and many qualities of the original piece in terms of color saturation. This process also adds some texture to the final product.

A lithograph is the least manually intensive reproduction technique, and in turn, is not as expensive as a serigraph or giclee. Although images can have a high resolution, and excellent appearance, they will not have the same degree of resolution or color density as a serigraph or giclee.

Gicl�e (pronounced "zhee-clay") is a French word meaning "a spraying of ink.� With the advent of gicl�e, the art of reproducing fine art has become even more precise. Gicl�es have the highest apparent resolution available today -- as high as 1,800 dots per inch. In addition, since no screens are used, the prints have a higher apparent resolution than lithographs and a color range that exceeds that of serigraphy. Displaying a full color spectrum, gicl�e prints capture every nuance of an original and have gained wide acceptance from artists and galleries throughout the world.

Silkscreening, which was introduced around 1907, presses ink through a fine screen onto paper. A stencil of an image is placed on a taut screen with paper underneath. Ink is then spread on top and forced through the screen onto the paper with a squeegee. Unlike photo-offset, silkscreens (also called serigraphs) allow the artist to vary the colors and patterns while printing.

The patented printing technology utilizes microscopically fine droplets of ink to form the image. A print can consist of nearly 20 billion ink droplets. The microscopic droplets of ink vary in sizes (approximately the size of a red blood cell) and density. This unique patented feature produces a near continuous tone image, smoother gradation between tones, and a more finely differentiated color palette.

A lithograph is created using a printing technique based on the principle that oil and water do not mix. Using oil-based ink or a grease crayon, an image is drawn on a flat stone or metal plate. Water is applied to the surface and is repelled by the areas where oil-based images have been drawn. The entire surface is then coated with an oil-based ink that adheres only to the areas drawn in oil, ink or crayon. The image is then printed on paper. Lithography became a popular printing technique because thousands of exact replicas could be made that were like drawings on paper, without degradation of the image.