照片转上下分层粉笔海报

Please make each photo I upload into an independent high-end design poster, no multi-photo stitching, each photo output separately. The overall composition is 3:4 vertical, with the top and bottom two areas strictly 1:1 in height, each occupying 50% of the screen.

The upper part keeps the original photo, maintaining the subject identity, structure, posture, real texture, natural lighting, and original color atmosphere, with only slight high-end color grading to give it the texture of an art magazine, independent publication, or exhibition image. To adapt to the frame, the environmental background can be naturally extended, but the subject must not be stretched, distorted, or changed. The upper part only puts the uploaded photo itself, follows the original framing, and does not add any text, borders, or graphics.

The lower part extracts the most recognizable subject, silhouette, posture, and narrative relationship from the photo, and reconstructs it as a chalk drawing on a blackboard: a deep green-black blackboard, with a piece of gray-white chalk dust wiped out by an eraser as the base, and the subject drawn with just a few chalk lines.

The composition follows 'one subject, one wiped area, large area of black': the subject is drawn in the wiped dusty surface in the lower middle of the blackboard, occupying about one-third of the lower half, and the remaining large area remains a dark blackboard, making the blackboard itself the main part of the picture. Use a broken chalk line to represent the ground or boundary, do not draw the background, and do not fill up the lines.

The color scheme is based on the deep green-gray of the blackboard, the subject uses white chalk, only one yellow chalk is used for emphasis in one place, and the rest are gray-white powder marks and erasure marks, with no more than three colors in total.

The texture must be a real blackboard chalk texture: the granularity and intermittency of the chalk, lines that vary in thickness due to different pressure, arc-shaped erasure marks left by wiping the blackboard and floating dust, and faint old handwriting marks on the old blackboard that cannot be washed away. There is a small section of wooden chalk trough at the bottom edge of the screen, with only a piece of broken chalk lying in the trough.

The text is like a teacher casually writing on the blackboard: a very short chalk handwritten main title, with several very small casual annotations nearby, such as arrows, numbers, and short English phrases, scattered around the subject, wiped together with the subject, with erasure marks and powder at the edges. The text hierarchy remains restrained: one main title plus a maximum of three small annotations, the font is natural handwritten chalk font, not digital font.

The overall pursuit is quiet, classroom feel, hand-written feel, with blank space, and a bit of nostalgia. Avoid random use of colored chalk, full-screen graffiti, complex backgrounds, realistic painting, neon or fluorescent effects, commercial advertising copy, and template feel.

请将我上传的每一张照片分别制作成一张独立的高级设计海报，不多图拼接，每张照片单独输出。整体采用3:4竖版构图，上下两个区域高度严格1:1，各占画面50%。

上半部分保留原始照片，保持主体身份、结构、姿态、真实质感、自然光影和原有色彩氛围，仅进行轻微高级调色，使其具有艺术杂志、独立出版物与展览图像质感。为适配画幅，可自然扩展环境背景，但不得拉伸、扭曲或改变主体。上半部分只放上传的照片本身，沿用原有取景，不添加任何文字、边框或图形。

下半部分提取照片中最具识别性的主体、轮廓、姿态与叙事关系，重构为一幅黑板上的粉笔画：深绿黑色的黑板，被板擦擦出一片灰白的粉雾做底，主体只用几笔粉笔线条画出来。

构图遵循“一个主体、一片擦过的区域、大面积留黑”：主体画在黑板中偏下的擦痕雾面里，占下半部分约三分之一，其余大面积保持深色黑板，让黑板本身成为画面的主要部分。用一条断续的粉笔线表示地面或边界，不画背景，不填满线条。

配色以黑板的深绿灰为底，主体用白色粉笔，只在一处用一支黄色粉笔作重点，其余是灰白的粉痕和擦痕，整体不超过三种颜色。

材质必须是真实的黑板粉笔质感：粉笔的颗粒与断续，线条因用力不同而粗细变化，擦黑板留下的弧形擦痕和浮起的粉尘，旧黑板上洗不掉的淡淡旧字痕。画面底部边缘有一小段木质粉笔槽，槽里只躺着一截断粉笔。

文字像老师随手写在黑板上：一个极短的粉笔手写主标题，旁边几处极小的随手批注，如箭头、编号、简短的英文短语，围绕主体散开，与主体一起被擦过，边缘有擦痕和粉末。文字层级保持克制：一个主标题加最多三处小批注，字体是自然的手写粉笔字，不是数码字体。

整体追求安静、教室感、手写感、有留白、有一点怀旧。避免彩色粉笔乱用、满屏涂鸦、复杂的背景、写实的绘画、霓虹或荧光效果、商业广告文案和模板感。