Objective is the short statement at the top of the resume which tells the employer your capability and interest in that field. Your objective is the short introduction of yourself. Objective is the very short part of your resume but is very important part.
While, the length of your objective depends on the position you are applying for. Some objectives are unclear and some are lengthy that specifies about carrier interests, skills, goals and accomplishments. However, designer objective should not be more than 3 to 4 lines, if it is so long then possibility of reading by the employer are very less.
When you are building your resume first include your current goal. When you are applying for designer position you may start with "Looking for a position of designer" and if you are referring some advertisements then use the title that company used in advertisement.
You can add summary of your qualification and skills in short in your objective such as seeking for a position of graphic designer to utilize my skills and creative talents in designer field. Make sure that you are not addressing your wishes of the prospect.
A designer must have to avoid some unnecessary things as like a common objective at the top of the resume and unclear skills or interests that are not related to design. Mention what type of designer you are. If you have some different skills and got some awards, you can mention it into your objective.
Looking for a position in web designing company where I can get room and excellent mobility to grow.