## 1 Introduction  
The skin, as the body's largest organ, serves not only as a protective barrier but also as a key indicator of systemic health and well-being. Its appearance is influenced by the interplay of structural components and chromophores, such as melanin and hemoglobin, which contribute to pigmentation and vascular tone. These chromophores, along with collagen and elastin in the dermis, define the texture, elasticity, and overall visual quality of the skin [1, 2]. Acne scars, which result from chronic inflammation of sebaceous glands, form due to insufficient production of fibrous connective tissue during the healing process. This leads to depressions and irregularities in the skin's surface, significantly altering its texture and appearance. The formation of these scars involves the epidermis, dermis, and subcutaneous tissue. Prolonged inflammation within the pilosebaceous unit causes tissue damage, leading to the contraction and weakening of collagen fibers, as well as a reduction in subcutaneous fat under the influence of inflammatory mediators. These processes create visible deficits in the skin [3; 4; 5]. Atrophic acne scars present in various forms depending on their shape and depth. Ice-pick scars are narrow and deep, often extending into the subcutaneous tissue, while boxcar scars have sharply defined edges and deep, flat bases. Rolling scars, in contrast, feature shallow depressions with soft, wavy contours and indistinct edges [6; 7; 8]. In recent years, laser therapy has revolutionized the management of acne scars, offering a precise, minimally invasive, and highly adaptable treatment option. Among the available laser technologies, the erbium glass laser (1550 nm) has attracted significant attention for its ability to provide non-ablative treatment. In contrast to ablative lasers, which cause fractional tissue vaporization, erbium glass lasers denature proteins without inducing their vaporization, allowing for collagen remodeling and texture improvement while preserving the epidermis. This approach minimizes downtime, reduces the risk of side effects, and ensures better patient comfort during and after the procedure [9; 10; 11]. The efficacy of erbium glass lasers lies in their ability to target water molecules in the dermis, delivering controlled heat to initiate neocollagenesis and improve the skin's elasticity. This makes them particularly suitable for treating atrophic scars, where collagen loss plays a central role in scar formation. Despite its widespread clinical use, objective and reproducible methods to assess treatment outcomes remain limited, often relying on subjective visual assessments. In clinical dermatology, the assessment of scar severity and treatment outcomes often relies on a visual examination [12]. However, this approach is inherently subjective, influenced by individual perception, variations in skin tone, and subtle differences in scar texture, leading to potential inconsistencies and misinterpretations. Although visual assessments provide a general overview, they lack the required precision for consistent and reproducible evaluations. Photography is essential for assessing acne scars, serving as a standardized tool for documenting skin condition before and after treatment [13; 14; 15; 16]. However, conventional clinical photography often lacks quantitative precision in evaluating scar texture, depth, and irregularities. To address this limitation, our study integrates advanced texture analysis methods, including the Gray-Level Co-occurrence Matrix (GLCM) with color-channel separation, to enhance the accuracy of scar assessment. By isolating the R, G, and B channels before texture extraction, we improve the detection of subtle structural differences in atrophic scars, such as ice-pick, boxcar, and rolling scars. This combination of visual assessment and quantitative image analysis provides a more precise method for monitoring treatment outcomes and contributes to the development of more effective therapeutic protocols.